Primary drug resistance among HIV-1 patients in Hubei Province in 2020-2022 / 公共卫生与预防医学

Objective To investigate the prevalence of primary drug resistance among HIV-1 patients in Hubei Province from 2020 to 2022, and to provide corresponding basis and data support for HIV antiviral therapy (ART) in Hubei Province. Methods During 2020-2022, plasma samples of HIV-1 infected patients before ART were collected., Patients’ demographic data and baseline laboratory test data were also collected. HIV-1 pol region was amplified by in-house method for sub-type typing and drug-resistant mutation site analysis. Results The pol gene sequence was successfully amplified in 242 of 285 cases, with a success rate of 84.9%. CRF07_BC was the predominant HIV-1 sub-type, accounting for 47.11% (114/242), followed by CRF01_AE, accounting for 25.21% (61/242), sub-type B, accounting for 14.16% (35/242), and CRF55_01B, accounting for 4.13% (10/242). The primary resistance rate was 6.20% (15/242). The mutation site of nucleoside reverse transcriptase inhibitors (NRTIs) was mainly M184V, and the mutation sites of non-nucleoside reverse transcriptase inhibitors (NNRTIs) were mainly E138A/G/EG and V179E. These different mutation sites led to different degrees of drug resistance to 12 drugs. The incidence of drug resistance mutation of CRF55_01B sub-type was significantly higher than that of other sub-types. Conclusion The primary drug resistance rate of HIV-1 infected patients is at a slightly high level in Hubei Province, and close monitoring of primary drug resistance and mutation sites should be strengthened before ART, especially for CRF55_01B sub-type.

Application of LAg-avidity EIA in the estimate of HIV-1 incidence among key surveillance populations in Hubei Province / 公共卫生与预防医学

Objective Limiting antigen avidity enzyme immunoassay (LAg-Avidity EIA) was applied to calculate the HIV-1 incidence of new HIV infections among men who have sex with men(MSM), drug users(DUS), female sex workers(FSW) and male patients in sexually transmitted diseases clinics(STD) in 2017-2020 of Hubei. Methods HIV-1 antibody positive samples were collected from four key groups in the national HIV sentinel surveillance from 2017 to 2020, and tested by the LAg-Avidity EIA to estimate the annual new infection rate of each group. Results The prevalence of MSM was 2.90%, 4.48%, 3.63 and 2.78% from 2017-2020, respectively, which was the highest among the four groups. The rate of late diagnosis increased from 16.67% in 2017 to 28.81% in 2020.The incidence of MSM was 1.64%(0.85%-2.44%),1.41%(0.59%-2.23%),1.46% (0.71%-2.21%) and 0.96%(0.34%-1.57%), respectively, and the difference was not statistically significant (χ2=1.491, P=0.684). The prevalence of STD from 2017-2020 was 0.03%, 0.01%, 0.06% and 0.08%, respectively, with the incidence was 0.09% (-0.06%-0.25%), 0.10(-0.06%-0.26%), 0.26% (0.02%-0.50%) and 0.04%(-0.07%-0.15%). The prevalence and incidence among FSW remains very low, while the prevalence of DUS fluctuated slightly, but no new infections have been detected. Conclusion The incidence of new HIV infection among MSM in Hubei province from 2017-2020 is relatively high compared with other key groups, but the overall trend is declining, thus the intervention of MSM should be further strengthened and expand the coverage of testing in key populations.

Surface display of HPV16L1 by autotransporter Ag43 / 中华微生物学和免疫学杂志

Objective:To construct a surface display system containing various lengths of the Ag43 passenger domain for an optimal bacterial surface display of foreign protein HPV16L1.Methods:(1) Ag43 gene sequences of different lengths were inserted into pET22b vector to construct four Ag43 surface display vectors (Ag43/138, Ag43/551, Ag43/552 and Ag43/700) using PCR and subcloning strategy. (2) The generation of four HPV16L1-Ag43 fusion constructs was completed by PCR and subcloning methods. (3) HPV16L1-Ag43 fusion proteins were expressed and analyzed by SDS-PAGE. (4) The surface exposure of HPV-16L1 was verified using trypsin digestion.Results:PCR analysis and sequencing results showed that Ag43 surface display vectors and HPV16L1-Ag43 fusions were constructed successfully. SDS-PAGE showed that the expression of HPV16L1-Ag43 fusion proteins could be induced with 0.2 mmol/L IPTG and the protein content was reduced after the cells were treated with trypsin, especially the content of Ag43/700-HPV16L1 that showed a drastic reduction.Conclusions:The Ag43 surface display system was successfully constructed and could be used for a successful display of HPV16L1. This study also showed that Ag43/700 comprising only the α-helix and the β-barrel of Ag43 provided an optimal surface display for HPV16L1.

Isoflavones from Sojae Semen Praeparatum Regulate Lipid Metabolism in Atherosclerotic Mice Through PPARγ/LXRα/ABCA1 Signaling Pathway / 中国实验方剂学杂志

ObjectiveTo study the effect of isoflavones from Sojae Semen Praeparatum （ISSP） on lipid metabolism in atherosclerotic mice， and decipher the underlying mechanism via the peroxisome proliferator-activated receptor gamma/liver X receptor alpha/ATP-binding cassette transporter A1 （PPARγ/LXRα/ABCA1） signaling pathway. MethodFifty ApoE-/- mice were randomly assigned into the model group， western medicine （atorvastatin calcium， 3.03 mg·kg-1） group， and low-， medium-， and high-dose ISSP （2.5， 5， 10 mg·kg-1， respectively） groups， with 10 rats in each group. Atherosclerosis model mice were established by bilateral ovariectomy and feeding high-fat diet. Another 10 ApoE-/- mice receiving ovariectomy and high-fat diet were taken as the sham group. Some mice died of postoperative infection， and finally 6 mice were included in each group. One week after operation， each group was administrated with corresponding drugs or equivalent amount of normal saline. After 12 weeks， the levels of triglyceride （TG）， total cholesterol （TC）， high-density lipoprotein cholesterol （HDL-C）， low-density lipoprotein cholesterol （LDL-C）， and non-esterified fatty acids （NEFAs） in serum and liver tissue were measured. The levels of tumor necrosis factor-α （TNF-α） and interleukin-6 （IL-6） in serum were detected by enzyme-linked immunosorbent assay （ELISA）. Hematoxylin-eosin （HE） staining and oil red O staining were used for observation of aortic plaque formation and liver lipid deposition. The mRNA and protein levels of PPARγ， LXRα， ABCA1， and ATP-binding cassette transporter G1 （ABCG1） in liver were determined by real-time fluorescence quantitative polymerase chain reaction （Real-time PCR） and Western blot. ResultCompared with the sham group， the modeling of atherosclerosis increased the aortic plaque area （P<0.01）， elevated the serum TC， TG， LDL-C， TNF-α， and IL-6 levels （P<0.01）， decreased the level of HDL-C （P<0.01）， increased the liver index （P<0.05） and the levels of TC， TG， and NEFAs in liver （P<0.01）， and caused obvious hepatic fat vacuoles and lipid deposition. In addition， the modeling down-regulated the mRNA levels of PPARγ， LXRα， ABCA1 in liver （P<0.05， P<0.01），and regulated the mRNA and protein levels of ABCG1（P<0.05， P<0.01）. Compared with the model group， atorvastatin calcium and middle-， high-dose ISSP reduced the serum TC， TG， LDL-C， TNF-α， and IL-6 levels （P<0.01）， decreased the liver index （P<0.01）， alleviated the liver fat vacuoles and lipid deposition， and increased the levels of TC， TG， and NEFAs in the liver （P<0.05， P<0.01）. Furthermore， they up-regulated the mRNA and protein levels of PPARγ， LXRα， ABCA1， and ABCG1 in the liver （P<0.05， P<0.01）. ConclusionISSP may regulate lipid metabolism through PPARγ/LXRα/ABCA1 signaling pathway to down-regulate the expression of inflammatory cytokines in serum and alleviate liver lipid deposition， thereby suppressing the formation of atherosclerotic plaque.

Epidemiological characteristics and etiological analysis of rotavirus group A in children under 5 years old in Hubei 2018-2019 / 公共卫生与预防医学

Objective To investigate the epidemiological and etiological characteristics of group A rotavirus (RV) in children under 5 years of age with acute diarrhea in Hubei province from 2018 to 2019, and to provide evidence for prevention and control of RV in key population. Methods A total of 922 fecal samples were collected from children aged 5 years and younger with diarrhea from 2018 to 2019 in sentinel hospitals of viral diarrhea surveillance in Hubei Province. Reverse transcription- Polymerase chain reactions were used for RV nucleic acid detection. VP7 and VP4 genes were amplified from RV positive samples, respectively. G and P genotypes were analyzed after sequence analysis. Results From 2018 to 2019, the positive rate of RV group A virus infection in children aged 5 years and under in Hubei province was 12.58%, and there was no significant difference between male and female infection (χ2=0.206, P>0.05).The positive rate of RV in group A was significantly different among different age groups (χ2=28.399, P<0.05). The main infected population was between 7 and 12 months and between 13 and 24 months. RV infection showed obvious seasonality, the prevalence appeared in December, and the prevalence peaked in January to March of the following year. Four G genotypes (G1, G2, G3 and G9) and two P genotypes (P[8] and P[4]) were found by G and P genotypes analysis of VP7 and VP4 genes of RV group A virus. There were 5 genotype combinations of G and P, the main genotype was G9P[8], followed by G1P[8], G2P[4], G3P[8] and G2P[8]. Conclusion The genotypes of group A RV virus in children with diarrhea in Hubei province from 2018 to 2019 are diverse, and the main type is G9P[8]. People aged between 6 months and 24 months are the key population for prevention and control of RV in children aged 5 years and younger with diarrhea. Strengthen the protection of key population and vaccinations are helpful for prevention and control of RV diarrhea infection.

A retrospective analysis of 2 728 HIV antibody screening positive samples / 公共卫生与预防医学

Objective To analyze the positive results of HIV antibody screening in the laboratory of AIDS confirmation center of Hubei Provincial Center for Disease Control and Prevention from 2014 to 2020, and to provide a basis for improving detection strategies. Methods A total of 2 728 primary screening positive specimens received by the laboratory of Hubei confirmation center from 2014 to 2020 were retested with two reagents. Specimens with at least one reactive result were confirmed with western blot (WB). The samples with uncertain or negative WB results were further confirmed by nucleic acid quantitative detection. The test results were analyzed retrospectively. Results A total of 2 297 specimens with positive retest results were confirmed by WB, with a positive rate of 93.47%. The highest proportion of patients was from medical institutions. The positive rate detected by 4 diagnostic kits was apparently higher in S/CO＞10 cases than that in S/CO≤10, and the difference was statistically significant (P 5 000cps / ml, and 12 cases were TND. 13 of the 30 WB negative samples had nucleic acid test results＞5 000CPs/mL . Conclusions The coverage of HIV screening laboratories in hospitals at all levels should be further increased to find more HIV infected persons. The anti-HIV ELISA S/CO ratio is correlated with the positive results confirmed by western blot. Therefore, ELISA S/CO ratio can be used to predict anti-HIV antibody positivity. For samples with uncertain or negative WB detection, supplemental nucleic acid test should be carried out timely for early diagnosis.

Molecular traceability of the pathogen of the first local dengue infection outbreak in Hubei Province in 2019 / 公共卫生与预防医学

Objective To identify the etiology of the first local dengue infection outbreak in Hubei Province in 2019, and to determine the serotype and genotype of the virus and trace its source. Methods Serum samples were collected from dengue fever cases in the acute phase. The IgM and IgG antibodies were detected by enzyme-linked immunosorbent assay (ELISA)，and the serotype was determined by fluorescence quantitative PCR. C6/36 cells were used to isolate virus and obtain virus E gene and complete genome sequence for systematic evolution analysis to trace the possible source of infection. Results The pathogen of the outbreak was identified as dengue serotype I infection，and five virus strains were isolated. Sequence analysis showed that the virus belonged to genotype I of dengue I, and had the highest homology with the strain isolated in Guangzhou, 2019. Conclusion The first local dengue infection outbreak in Hubei Province in 2019 was caused by genotype I of the type I dengue virus.

Effect of Acupuncture and Biofeedback on Fecal Incontinence after Anus Preservation Operation for Rectal Cancer / 中国康复理论与实践

Objective:To investigate the effect of acupuncture and biofeedback on the recovery of fecal incontinence after anus preservation operation for rectal cancer. Methods:From January 1st, 2016 to June 30th, a total of 226 patients with rectal cancer after anus preservation operation were selected. Finally, 120 patients with fecal incontinence were randomly divided into control group (n = 40), acupuncture group (n = 40) and observation group (n = 40). All the groups accepted levator ani movement. In addition, the acupuncture group received acupuncture, and the observation group received acupuncture and biofeedback, for three months. Cleveland Clinic Florida Faecal Incontinence Scores (CCF-FIS), anorectal pressure, pelvic floor surface electromyography and quality of life were measured before treatment, and one month, two months and three months after treatment. Results:There was no significant difference in CCF-FIS, anorectal pressure, pelvic floor surface electromyography and quality of life among three groups before treatment (F < 2.943, P > 0.05). After treatment, all the above indexes improved (F > 5.235, P < 0.01), and were better in the acupuncture group and observation group than in the control group (P < 0.05), especially in the observation group (P < 0.05) at each time point. The curative effect of the observation group was related to the location of the tumor (χ2 > 4.405, P < 0.05) one month after treatment, and it was related to whether pelvic autonomic nerve preservation was performed during the operation (χ2 > 4.706, P < 0.05) and whether radiotherapy was added after the operation (χ2 > 5.013, P < 0.05) at each time point after treatment. At three months follow-up, the recurrence rate was lower in the observation group (8.6%) than in the acupuncture group (35.7%) and in the control group (35.0%) (χ2 > 5.976, P < 0.05). No complication occurred in all groups. Conclusion:Acupuncture and biofeedback can improve the symptoms of defecation incontinence and promote the recovery of anal function after anus preservation operation for rectal cancer.

Application of preoperative three-dimensional image reconstruction in the treatment of ureteropelvic junction obstruction / 北京大学学报(医学版)

OBJECTIVE@#To investigate the value of preoperative three-dimensional image reconstruction in the treatment of ureteropelvic junction obstruction (UPJO).@*METHODS@#We reviewed data on 40 patients (22 male cases, and 18 female cases) diagnosed with UPJO in Peking University First Hospital from May 2017 to April 2019. The median age was 26.5 years (IQR 23.25-38.75) years. There were 11 patients complicated with ectopic vessels, 14 patients with kidney stones, 3 patients with horseshoe kidney, and 6 patients with obstruction after pyeloplasty. All the patients underwent preoperative enhanced CT scan, and the CT data were reconstructed into three-dimensional image models. The obstruction position of ureteropelvic junction and the relationship between ureteropelvic junction and blood vessels and organs were observed by three-dimensional models to assist planning surgery. Thirty-seven patients underwent laparoscopic pyeloplasty (including 3 cases combined with pyelolithotomy with flexible cystoscope, 1 case combined with pyelolithotomy by sun-style cystoscope, 1 case with laparoscopic ureter resection and anastomosis, 3 cases of laparoscopic pyeloplasty of horseshoe kidney), 2 patients underwent laparoscopic ventral onlay lingual mucosal graft ureteroplasty, and 1 patient underwent robot-assisted laparoscopic pyeloplasty.@*RESULTS@#Three-dimensional CT image clearly showed the relationship between the obstruction of ureteropelvic junction and blood vessels and organs after three-dimensional reconstruction. The type, diameter, position and direction of the ectopic vessels could be observed clearly before operation according to the three-dimensional reconstruction model, and the number, size, location and shape of renal calculi or other masses, the number of involved renal calyces and the anatomical distribution in the renal pelvis and calyces could be also evaluated preoperatively. After comprehensive analysis of the above information, individualized operation plans were performed on the patients, all the 40 cases were successfully completed with the surgery without any transfer to open surgery. The average operative time was (129.91±37.90) min (range: 75 to 273), the average blood loss was (48.1±78.0) mL (range: 10 to 400), the average hospitality was (5.04±1.99) d (range: 2 to 10), and the average postoperative drainage time was (3.8±1.4) d (range: 2 to 8).@*CONCLUSION@#The preoperative three-dimensional image reconstruction has a high clinical value in the treatment of ureteropelvic junction obstruction, and it is of great help to assist surgery planning and is worthy of further clinical promotion and application.

Clinical Efficacy of Modified Buyang Huanwu Tang Combined with Sanrentang in Treatment of Spleen and Kidney Deficiency and Damp-heat and Blood Stasis Syndrome in Early Diabetic Nephropathy / 中国实验方剂学杂志

Objective::To observe the clinical efficacy of modified Buyang Huanwu Tang combined with Sanrentang in treating early diabetic nephropathy(DN)with deficiency of spleen and kidney, damp-heat and blood stasis syndrome and its effect on glucose and lipid metabolism, oxidative stress and inflammatory factors, in order to explore its mechanism. Method::A total of 72 early DN atients were randomly divided into control group and treatment group, with 36 cases in each group. The control group was orally treated with losartan potassium tablets(50 mg every time, once/day), while the treatment group was treated with modified Buyang Huanwu Tang combined with Sanrentang orally in addition to the therapy of the control group(1 dose/day). Both groups were treated for 3 months. The changes in clinical efficacy and safety indicators were observed for both groups. The 24 h urine albumin excretion rate(UAER), serum creatinine(SCr), serum cystatin C(Cys C), urea nitrogen (BUN), fasting blood glucose (FBG), 2 h postprandial blood glucose (2 hPG), glycosylated hemoglobin (HbA1c), total cholesterol (TC), triglyceride(TG), low-density lipoprotein cholesterol(LDL-C), high-density lipoprotein cholesterol(HDL-C), malondialdehyde(MDA), superoxide dismutase(SOD), glutathione Peroxidase(GSH-Px), interleukin-2(IL-2), interleukin-4(IL-4), interleukin-8(IL-8), interleukin-10(IL-10), tumor necrosis factor-α(TNF-α)of patients in two groups were observed before and after treatment. Result::The total clinical effective rate was 88.9%in therapy group, which was higher than 61.1%in control group(P<0.05). After treatment, levels of UAER, SCr, Cys C and BUN were lower in both groups(P<0.05), and the levels in treatment group were all lower than those in control group(P<0.05). Levels of FBG, 2 hPG and HbA1c were lower in both groups(P<0.05). There was no significant difference in FBG, 2 hPG and HbA1c levels between two groups after treatment. The levels of HDL-C were higher in both groups(P<0.05), and the levels in treatment group were higher than that in control group(P<0.05). The levels of TC, TG and LDL-C were lower in both groups(P<0.05), and the levels in treatment group were all lower than those in control group(P<0.05). The level of MDA was lower in both groups(P<0.05), and the level in the treatment group was lower than that in control group(P<0.05). The levels of SOD and GSH-Px were higher in both groups(P<0.05), and the levels in the treatment group were all higher than those in the control group(P<0.05). Serum levels of IL-2, IL-8 and TNF-α were lower in both groups(P<0.05), and the levels in the treatment group were lower than those in control group(P<0.05). Serum levels of IL-4 and IL-10 were higher in both groups(P<0.05), and the levels in the treatment group was higher than those in control group(P<0.05). Conclusion::Modified Buyang Huanwu Tang combined with Sanrentang is effective and safe in the treatment of early DN with spleen and kidney deficiency, damp-heat and blood stasis syndrome. They can further improve renal function and lipid metabolism, inhibit oxidative stress reaction and regulate the secretion balance of inflammatory factors in early DN patients.

Investigation and analysis of the status of new coronavirus contamination in biosafety laboratories / 公共卫生与预防医学

Objective To understand the status of new coronavirus contamination in the biosafety laboratory environment, identify key areas prone to contamination, and provide evidence for disinfection of central objects. Methods surfaces of high-frequency contact environment and protective equipment were sampled with moistened sterile cotton swabs after experiment and before disinfection, the results of the one-step real-time reverse transcription polymerase chain reaction (RT-PCR) of open reading frame 1ab and N fragment were used to evaluate the pollution status. Results Environmental surveys found 4 of 217 samples of environmental objects to be positive for new coronavirus RNA, that positive rate was 1.84%. Among them, BSL-3, BSL-2, and BSL-1 were sampled 23, 184, and 10 respectively. The 3 positive samples were from surfaces of nucleic acid extraction room of BSL-2 and from the handles of pass-through box, laboratory door handles and the outer surface of the alcohol watering pot respectively. The 1 positive sample was from the forearm of the protective clothing in BSL-2 laboratory. Conclusion There was a certain degree of virus pollution in key areas of the new coronavirus laboratory. The BSL-2 laboratory has a higher risk of environmental pollution than the BSL-3 and BSL-1 laboratories.

Effect of Xiexintang Containing Serum on Expression of TLR9/MyD88/NF-κB p65 Signal Pathway in Foam Cell / 中国实验方剂学杂志

Objective: The effect of Xiexintang on Toll like receptor 9 (TLR9) signaling pathway in macrophage derived foam cells was studied by in vitro cell experiments. Method: The fifty SPF male SD rats were randomly divided into low, medium and high dose groups (1.4,4.2,12.6 g·kg-1·d -1) and normal groups. Except 20 rats in the normal group, 10 rats in each group were given equal volume of pure water gavage in the blank group. After the last Administration for 7 days, serum was separated,and the serum containing drugs in the low, medium and high dose groups of Xiexintang was prepared. Oxidized low density lipoprotein (ox-LDL) was used to intervene the differentiation of RAW264.7 macrophages into foam cells. The cell foam was identified by oil red O staining. After observing the effect of drug containing serum on the proliferation of macrophage derived foam cells by methye thiazolye telrazlium(MTT) method,the serum containing 20%concentration of each drug was selected to act on the foam cell model. The expression of interleukin(IL) -1β and interferon (INF) -γ was determined by enzyme-linked immunosorbent assay (ELISA) and real-time fluorescence quantitative PCR (Real-time PCR). TLR9, myeloid differentiation factor 88(MyD88)and nuclear factor(NF) -κB were detected by Western blot. Result: Oil red O staining showed that the red particles were obvious after ox-LDL intervention. The foam cell model was successfully prepared. MTT results showed that there was no significant difference in cell proliferation between the high dose group of Xiexintang in the 10%~30%concentration range and the normal group serum. Follow up selection of the serum containing 20%concentration of each dose intervened the foam cells induced by ox-LDL. Compared with the normal group,the model group after ox-LDL intervention induced the high expression of TLR9,MyD88,NF-κB p65,IL-1β,INF-γ (PPκB p65,IL-1β,INF-γ(PPConclusion: Xiexintang containing serum can inhibit ox-LDL-induced RAW264.7 macrophage foaming,and its mechanism may involve regulation of TLR9/MyD88/NF-κB p65 signaling pathway and inhibition of IL-1β and INF-γ overexpression. This may be one of its mechanisms of against atherosclerosis.

Impact of sealing method and layer number of autoclave bag on autoclave sterilization effect in the BSL-3 laboratory / 中华实验和临床病毒学杂志

Objective@#To evaluate, the method of different packing layer and sealing mode for the packaging of the infectious wastes in order to achieve better autoclave sterilization effect.@*Methods@#In the autoclave cycles P4 and P9, different packing layer (single, double and triple) and sealing mode (slightly folded, autoclave tape, nylon tape closure) were applied to the internal infectious waste sterilization, biological indicators were used to detect the effect of autoclave sterilization of the upper, middle and lower layers, respectively.@*Results@#1) In the autoclave cycle P4, the triple autoclave bags packaging sealing method was based on the slight folding, autoclave tape, and nylon taple, the biological indicator negative rate of the internal infectious waste in the upper layer, the middle layer and the lower layer were respectively in the upper layer 100%, 0%, 0%, in the middle layer 67%, 20%, 0%, and in the lower layer was 0%. The double autoclave bags packaging sealing method was based on the slight folding, autoclave tape, and nylon taple, the biological indicator negative rate of the internal infectious waste in the upper layer, the middle layer and the lower layer were respectively the in the upper layer 100%, 85%, 0%, the middle layer 45%, 0%, 0%, and the lower layer 10%, 0%, 0%. the single autoclave bag packaging sealing method wa based on the slight folding, autoclave tape, and nylon taple, the biological indicator negative rate of the internal infectious waste in the upper, middle and lower layers were respectively the upper layer 100%, 100%, 0%, the middle layer 70%, 45%, 0%, and the lower layer 12.5%, 0%, 0%. (2) In the autoclave cycle P9, the triple autoclave bags packaging sealing method was based on the slight folding, autoclave tape, and nylon taple, the biological indicator negative rate of the internal infectious waste in the upper layer, middle and lower layers were respectively the upper layer all 100%, the middle layer 100%, 100%, 70%, and the lower layer 100%, 100%, 30%. The double autoclave bags packaging sealing method was based on the slight folding, autoclave tape, and nylon taple, the biological indicator negative rate of the internal infectious waste in the upper, middle and lower layers were respectively the upper layer all 100%, the middle layer all 100% and the lower layer is 100%, 100%, and 60%. The single autoclave bag packaging sealing method was based on the slight folding, autoclave tape, and nylon taple, the biological indicator negative rate of the internal infectious waste in the upper, middle and lower layers were all 100%.@*Conclusions@#When autoclave is recommended for sterilization of infectious waste, the best effect was achieved with a single unsealed autoclave bag. If it is necessary to seal, the autoclave bag should not be completely sealed, avoiding incomplete penetration of steam into the interior space, otherwise the infectious waste can not be completely sterilized.

Factors affecting the fit of respirators in the biosafety level 3 laboratory / 中华实验和临床病毒学杂志

Objective@#To test the performance of two kinds of protective respirators (3M9332, 3M1860) used in Biosafety Level 3 Laboratory (BSL-3) to ensure whether it can fit well in different populations in order to reduce the risk of infection in the process of operating high-risk pathogenic microorganisms.@*Methods@#Using a 8038PortaCount®Pro+ respirator fit tester to examine the fitness of personnel wear 3M 1860 N95 and 9332 N99 respirators. The influence factors such as gender, age, shape of respirator were evaluated. Statistical analysis was performed by the fit factor(FF) of assigned actions.@*Results@#A total of 62 people conducted the respirator fit test, of which 45 people passed the test of 3M9332 respirators, the pass rate was 72.58%; only 6 people passed the test of 3M1860 respirators, the pass rate was 9.67%. The pass rate of two different types of respirators was analyzed statistically, P=0.000. The P value of assigned actions in deep breathing, head side to side, head up and down, talking, bending over were respectively 0.094, 0.076, 0.542, 0.000, 0.000.@*Conclusions@#The experimental results showed that the type of respirator had a significant effect on respirator fit in this study, but gender and age had no significant effect on factors. As to reduce the risk of leakage of the respirator, redundant actions should try to be avoided, especially loud talking and bending in the course of the experiment.

Analysis of influencing factors of dental caries in first permanent molars among children aged 10-12 years old in Guangzhou / 口腔疾病防治

Objective @# To know the influencing factors of dental caries in first permanent molars among children aged 10-12 years old in Guangzhou, and to give references for dental caries prevention.@*Methods @#The samples were selected by stratified random sampling method. Oral health examination and questionnaires were applied to all the 18 656 children who were 5 or 6-grade in 149 primary schools. @*Results @#The prevalence of dental caries in first permanent molars was 18.19%. Girls accouted for 19.96%, which was significantly higher than that of boys (16.71%) (χ2 = 32.817, P< 0.001). Multiple regression analyses were used to investigate the influencing factors of dental caries in first permanent molars. After controlling school cluster and other factors, household register, gender, pit and fissure sealant, consumption of sweets and chocolates, consumption of sweet milk were influencing factors of permanent teeth caries. And household register, gender, pit and fissure sealant, consumption of sweets and chocolates were associated with mean DMFT.@*Conclusion @#school oral health education should focus on the consumption of sugars and cares should be put into the differences between urban and rural area. In addition, strengthening publicity of the sealant retention project,raising public awareness, and improving sealant retention quality are necessary to ensure the anti-caries effect.

Establishment of Quality Control System of Nucleic Acid Detection for Ebola Virus in Sierra Leone-China Friendship Biological Safety Laboratory / 病毒学报

The quality control process throughout the Ebola virus nucleic acid detection in Sierra Leone-China Friendship Biological Safety Laboratory (SLE-CHN Biosafety Lab) was described in detail, in order to comprehensively display the scientific, rigorous, accurate and efficient practice in detection of Ebola virus of first batch detection team in SLE-CHN Biosafety Lab. Firstly, the key points of laboratory quality control system was described, including the managements and organizing, quality control documents and information management, instrument, reagents and supplies, assessment, facilities design and space allocation, laboratory maintenance and biosecurity. Secondly, the application of quality control methods in the whole process of the Ebola virus detection, including before the test, during the test and after the test, was analyzed. The excellent and professional laboratory staffs, the implementation of humanized management are the cornerstone of the success; High-level biological safety protection is the premise for effective quality control and completion of Ebola virus detection tasks. And professional logistics is prerequisite for launching the laboratory diagnosis of Ebola virus. The establishment and running of SLE-CHN Biosafety Lab has landmark significance for the friendship between Sierra Leone and China, and the lab becomes the most important base for Ebola virus laboratory testing in Sierra Leone.

Detection of Heart Rate of Fetal ECG Based on STFT and BSS / 中国医疗器械杂志

Changes in heart rate of fetal is function regulating performance of the circulatory system and the central nervous system, it is significant to detect heart rate of fetus in perinatal fetal. This paper puts forward the fetal heart rate detection method based on short time Fourier transform and blind source separation. First of all, the mixed ECG signal was preprocessed, and then the wavelet transform technique was used to separate the fetal ECG signal with noise from mixed ECG signal, after that, the short-time Fourier transform and the blind separation were carried on it, and then calculated the correlation coefficient of it, Finally, An independent component that it has strongest correlation with the original signal was selected to make FECG peak detection and calculated the fetal instantaneous heart rate. The experimental results show that the method can improve the detection rate of the FECG peak (R), and it has high accuracy in fixing peak(R) location in the case of low signal-noise ratio.

Correlation between a blood pressure variability-based scoring system and target organ damage in patients with hypertension / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the relationship between a blood pressure variability (BPV)-based scoring system (BPVSS) and the target organ damage in patients with hypertension.</p><p><b>METHODS</b>We selected 95 consecutive inpatients with essential hypertension admitted between January and June, 2015 in the Department of Cardiology of Guangzhou General Hospital of Guangzhou Military Command. The BPV indices were analyzed for their correlation with the parameters of target organ damage (IVSd, LVPWd, baPWV_L/R, and IMT_L/R). The patients with a BPVSS of 3.9 or higher (control, 43 cases) and those with a lower BPVSS (observation group, 52 cases) were compared for differences in IVSd, LVPWd, baPWV_L/R, IMT_L/R and the proportion of carotid plaques.</p><p><b>RESULTS</b>Similar with the traditional BPV indices, BPVSS was negatively correlated with IMT_L/R (r=-0.278/-0.324, P<0.05). BPVSS was also negatively correlated with IVSd (r=-0.241), LVPWd (r=-0.223), and baPWV_L/R (r=-0.468/-0.373) (P<0.05). IVSd, LVPWd, baPWV_L/R and IMT_L/R were all significantly higher in the observation group than in the control group (t=2.307, 2.516, 3.250/2.790, and 2.372/3.425, respectively; P<0.05). The proportion of carotid plaques in the observation group was significantly higher than that in the control group (Χ(2)=27.833, P<0.001).</p><p><b>CONCLUSION</b>BPVSS indicates the severity of target organ damage in patients with hypertension. A greater BPV is correlated with a lower BPVSS score and more severe damages of the heart and blood vessels.</p>

Study on changes of blood cell distribution width and D-dimer in patients with chronic obstructive pulmonary disease / 中国生化药物杂志

Objective To investigate the changes of blood cell distribution width and D-dimer in patients with chronic obstructive pulmonary disease.Methods 60 cases with chronic obstructive pulmonary disease were selected and according to the course of disease were divided into two groups.30 healthy people were selected to be the control group.MCV, RDW and D-dimer were detected and compared.ResuIts Compared with the control group, MCV and RDW of acute phase group and remission stage group are higher(P<0.05), compared with the remission stage group, MCV and RDW of acute phase group were higher(P<0.05), and RDW and MCV in the acute stage group were positively correlated with the remission stage group (r=0.717, 0.902, P<0.05).Compared with the control group, D-dimer of acute phase group and remission stage group were higher(P<0.05), compared with the remission stage group, D-dimer of acute phase group were higher(P<0.05), and D-dimer in the acute stage group were positively correlated with the remission stage group (r=0.727, P<0.05).ConcIusion The distribution of blood cell distribution width and D-dimer levels in patients with chronic obstructive pulmonary disease in acute stage and remission stage group were increased, and the increasing of patients with chronic obstructive pulmonary disease in the acute stage is more obvious.

Effect of autologous hematopoietic stem cell transplantation on serum trace elements and lactate dehydrogenase activity in patients with malignant lymphoma / 中国生化药物杂志

Objective To investigate effect of autologous hematopoietic stem cell transplantation on serum trace elements and lactate dehydrogenase activity in patients with malignant lymphoma.Methods 80 patients with malignant lymphoma collected in our hospital from May 2013 to May 2014,40 cases in each group, Hodgkin lymphoma ( HL) patients were treated with ABVD ( doxorubicin, bleomycin, vincristine, dacarbazine) regimen of chemotherapy; Non-Hodgkin,s lymphoma ( NHL) patients were treated with standard CHOP ( cyclophosphamide, vincristine, epirubicin, dexamethasone) regimen of chemotherapy of two group.Chemotherapy drugs combined with granulocyte colony stimulating factor ( G-CSF) was used to mobilize APBSC.Application of 10μg/(kg? d)G-CSF 5 in bone marrow suppression after chemotherapy, detected white cell increased 3.0 ×109/L , platelets rose to 50 ×109/L, collected APBSC,The frozen stock solution of cell was joined and frozen.24 h after pre-treatment, the frozen peripheral blood hematopoietic stem cells of the subclavian vein was transfused for patients in experimental group.Control group continued to receive chemotherapy. After treatment, the Cu level, Zn level and lactate dehydrogenase activity were detected in all patients.ResuIts After treatment, Zn levels of two groups increased (P<0.05), Cu and Cu/Zn levels decreased (P<0.05).Compared with control group, the level of Zn was higher in experimental group (P<0.05), and the level of Cu and Cu/Zn was lower (P<0.05).After treatment, the lactate dehydrogenase activity of two groups decreased (P<0.05), and experimental group was more lower than control groupy (P<0.05).ConcIusion Autologous hematopoietic stem cell transplantation can significantly reduce the level of Cu in patients with malignant lymphoma , elevate Zn level and decrease the activity of lactate dehydrogenase, which has guiding significance for clinical.