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Abstract@#Vaccine-hypervariable poliovirus type Ⅲ was detected in an acute flaccid paralysis infant at age of 6 months in Zhejiang Province in June, 2021, and the isolated and incubated virus had six nucleotide variations in the VP1 region as compared to the poliovirus Sabin vaccine strain. The infant had a history of three-dose poliovirus vaccination, and grade 2 muscle strength of the left upper limb upon onset. He was clinically diagnosed with cellulitis of the left shoulder, and recovered to normal following treatment. No abnormality was detected in the nervous system, and the infant was cured and discharged from hospital. No vaccine-hypervariable poliovirus was detected in subsequent infant' clinical samples or in close contacts, and no similar cases were identified during the active case detection by county/district medical institutions and among community populations. Since the infant did not present poliomyelitis-related clinical symptoms caused by vaccine-hypervariable poliovirus, poliomyelitis was excluded. The vaccine-hypervariable poliovirus was not spread because of timely identification and effective responses, suggesting the urgent need to maintain the sensitivity of the acute flaccid paralysis surveillance system and improve the coverage of poliovirus vaccination, so as to inhibit the transmission of poliovirus.
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Aging-elevated DNMT3A R882H-driven clonal hematopoiesis (CH) is a risk factor for myeloid malignancies remission and overall survival. Although some studies were conducted to investigate this phenomenon, the exact mechanism is still under debate. In this study, we observed that DNMT3A R878H bone marrow cells (human allele: DNMT3A R882H) displayed enhanced reconstitution capacity in aged bone marrow milieu and upon inflammatory insult. DNMT3A R878H protects hematopoietic stem and progenitor cells from the damage induced by chronic inflammation, especially TNFα insults. Mechanistically, we identified that RIPK1-RIPK3-MLKL-mediated necroptosis signaling was compromised in R878H cells in response to proliferation stress and TNFα insults. Briefly, we elucidated the molecular mechanism driving DNMT3A R878H-based clonal hematopoiesis, which raises clinical value for treating DNMT3A R882H-driven clonal hematopoiesis and myeloid malignancies with aging.
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Objective@#To establish an optimized path for health management of HBV infections among pregnant and lying-in women based on a Delphi method, so as to provide the evidence for intensifying the interruption of the mother-to-child transmission of HBV.@*Methods@#Based on literature review and previous studies, the preliminary framework and contents of the optimized path for health management of HBV infections were constructed. Experts from epidemiology, clinical medicine and maternal and children healthcare were invited to participate in two-round Delphi consultations, and the preliminarily designed indicators were screened and revised. The score for feasibility of each indicator was calculated, and the weight of each indicator was estimated using a proportional distribution method.@*Results@#Sixteen experts participated in the consultation, including 13 women. The participants had a mean age of (45.69±5.71) years, and a mean employment duration of (23.06±7.05) years. All participants had a degree of bachelor and above, and there were 14 experts with vice senior professional titles. The mean positive coefficient was 96.88% and the mean authority coefficient was 0.790 during the two-round expert consultations. There were significant differences in the coordination coefficient of importance, necessity and feasibility of indicators at all levels (P<0.05), and the coefficient of variation of the feasibility was all less than 0.250. The final optimized path for health management of HBV infections among pregnant and lying-in women included 6 primary indicators, 17 secondary indictors and 73 tertiary indicators. Among the primary indicators, delivery management (0.173 4), screening and evaluation (0.172 8) and pregnancy management (0.172 7) had a high weight.@*Conclusion@#A scientific and reliable optimized path is created for health management of HBV infections among pregnant and lying-in women, which has a potential value for improving the interruption of mother-to-child transmission of HBV.
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Objective@#To investigate the serum levels of anti-measles antibody among residents in Zhejiang Province in 2018, so as to provide insights into measles control.@*Methods@#Permanent residents aged 0 to 59 years were recruited using the stratified multistage random sampling method in Zhejiang Province in 2018, and subjects' demographic features, medical history of measles and history of immunization with measles-containing vaccine (MCV) were collected using a questionnaire survey. The serum level of anti-measles IgG antibody was detected, and the geometric mean concentration (GMC) of anti-measles IgG antibody was estimated. The seroprevalence, protective rate and GMC of anti-measles IgG antibody were compared among residents at different age groups and regions.@*Results@#A total of 4 189 residents were enrolled, including 1 939 males and 2 250 females, with a male to female ratio of 1∶1.16. There were 3 858 residents positive for anti-measles IgG antibody, with seroprevalence of 92.10%, and there were 2 072 residents with protective antibodies against measles, with a protective rate of 49.46%. The median GMC of anti-measles IgG antibody was 798.33 (interquartile range, 1 024.06) mIU/mL, and the protective rate of anti-measles IgG antibody appeared a tendency towards a decline with age ( χ2trend=18.067, P<0.001 ). There were significant differences in the seroprevalence ( χ2=45.090, P<0.001 ), protective rate ( χ2=57.432, P<0.001 ) and GMC of anti-measles IgG antibody (χ2=88.624, P<0.001 ) among residents at different regions, with the lowest seroprevalence of anti-measles IgG antibody in Ningbo City ( 85.19% ), the lowest antibody-protective rate (38.98%) and the lowest GMC [632.89 ( 909.04 ) mIU/mL] in Zhoushan City, the highest seroprevalence ( 95.16% ), antibody-protective rate (58.48%) and GMC [1 035.84 ( 1 301.77 ) mIU/mL] in Huzhou City.@*Conclusions@# The protective rate of anti-measles antibody was low and appeared a tendency towards a decline among residents in Zhejiang Province in 2018. There was a region-specific serum level of anti-measles antibody in Zhejiang Province in 2018.
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Objective@#To investigate the willingness to receive measles-containing vaccine (MCV) and its influencing factors among healthcare workers in the Yangtze River Delta region, so as to provide the evidence for improving the measles-containing vaccination rate@*Methods@#Healthcare workers were sampled from 19 medical institutions in each of Shanghai Municipality, Jiangsu Province, Zhejiang Province and Anhui Province for questionnaire surveys using a multi-stage stratified convenience sampling methods from July 2020 to March 2021. Participants' gender, age, educational level, professional title, measles-containing vaccination, awareness of MCV and willingness to receive MCV were collected, and the factors affecting the willingness to receive MCV were identified among healthcare workers using a multivariable logistic regression model. @*Results@#Totally 1 403 questionnaires were allocated, and 1 394 valid questionnaires were recovered, with an effective recovery rate of 99.36%. The respondents included 327 men and 1 067 women, with a male to female ratio of 1∶3.26, and 64.35% (897) were at ages of 31 to 50 years. There were 1 005 respondents with a bachelor degree (72.09%), 765 with middle and senior professional titles (54.88%), 676 with a history of measles-containing vaccination (48.49%), 1 176 with willingness to receive MCV (84.36%) and 218 without willingness to receive MCV due to convenience of vaccination (30.73%) and cost (19.27%). Multivariable logistic regression analysis showed that region (Zhejiang, OR=1.613, 95%CI: 1.054-2.470; Anhui, OR=2.058, 95%CI: 1.259-3.363), and no history of measles (OR=2.219, 95%CI: 1.302-3.781) were factors improving the willingness to receive MCV among healthcare workers, and hospital level (secondary, OR=0.483, 95%CI: 0.306-0.763; tertiary, OR=0.251, 95%CI: 0.160-0.394), history of measles-containing vaccination (no, OR=0.262, 95%CI: 0.172-0.399; unknown, OR=0.386, 95%CI: 0.266-0.559), and unawareness of MCV knowledge (OR=0.208, 95%CI: 0.081-0.536) were factors inhibiting the willingness to receive MCV among healthcare workers.@*Conclusions@#The willingness to receive MCV correlates with region, history of measles, hospital level, history of measles-containing vaccination and awareness of MCV knowledge among healthcare workers in the Yangtze River Delta region.
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Objective@#To evaluate the cost-benefit and cost-effectiveness of current strategy for preventing mother-to-child transmission (PMTCT) of hepatitis B virus.@*Methods@#A decision tree model with the Markov process was developed and simulated over the lifetime of a birth cohort in Zhejiang Province in 2016. The current PMTCT strategy was compared with universal vaccination and non-vaccination. Costs were assessed from social perspective. Benefits were the savings from reduced costs associated with disease and effectiveness were measured by quality-adjusted of life-years (QALY) gained. The net present value (NPV), cost-benefit ratio (BCR) and incremental cost-effectiveness ratio (ICER) were calculated. Univariate and Probabilistic Sensitivity Analyses (PSA) were performed to assess parameter uncertainties. The parameters of costs and utilities value of hepatitis B-related disease came from the results of the field survey, which were obtained by face-to-face questionnaire survey combined with inpatient medical records, including eight county and municipal hospitals in Jinhua, Jiaxing and Taizhou. A total of 626 outpatients and 523 inpatient patients were investigated. The annual total costs of infection was calculated by combining the costs of outpatient and inpatient.@*Results@#The PMTCT strategy showed a net-gain as 38 323.78 CNY per person, with BCR as 21.10, which was higher than 36 357.80 CNY per person and 13.58 respectively of universal vaccination. Compared with universal vaccination, the PMTCT strategy would save 2 787.07 CNY per additional QALY gained for every person, indicating that PMTCT would be cost-saving. The most important parameters that could affect BCR and ICER were the vaccine coverage rate and costs of hepatitis B related diseases respectively. The PSA showed the PMTCT strategy was preferable as it would gain more QALY and save costs.@*Conclusions@#The PMTCT strategy appeared as highly cost-beneficial and highly cost-effective. High vaccination rate was a key factor of high economic value.
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Objective To investigate the epidemiological characteristics of measles outbreak caused by genotype D8 virus in Pinghu city of Zhejiang province,and provide evidence for the control of the outbreak.Methods The measles outbreak data were collected through National Measles Surveillance System.The outpatient records and admission records were checked,field investigation and outbreak response were conducted.Blood samples in acute phase and swab specimens were collected from the patients for laboratory testing,including serology test,RNA extraction and amplification,measles virus isolation and genotype identification.Software SPSS 17.0 and Excel 2016 were used for data analysis.Results A total of 10 confirmed measles cases were reported in Pinghu city,and 8 cases were aged ＞40 years.Six blood samples were collected,in which 5 were measles D8 virus positive and 1 was negative in measles virus detection.There were epidemiological links among 10 cases which occurred in a factory,a hospital and a family at the same time.There was no statistical difference in symptoms among cases caused by D8 virus and H1a virus.After the emergent measles vaccination,the measles outbreak was effectively controlled.Conclusion Untimely response due to the uneasy detection of measles cases in the early stage,nosocomial infection and weak barrier of measles immunity in adults might be the main reasons for this outbreak.Measles vaccination is effective in the prevention of measles D8 virus infection.It is necessary to strengthen measles genotype monitoring for the tracing of infection source and control of outbreaks.
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Objective To investigate the epidemiological characteristics of measles outbreak caused by genotype D8 virus in Pinghu city of Zhejiang province,and provide evidence for the control of the outbreak.Methods The measles outbreak data were collected through National Measles Surveillance System.The outpatient records and admission records were checked,field investigation and outbreak response were conducted.Blood samples in acute phase and swab specimens were collected from the patients for laboratory testing,including serology test,RNA extraction and amplification,measles virus isolation and genotype identification.Software SPSS 17.0 and Excel 2016 were used for data analysis.Results A total of 10 confirmed measles cases were reported in Pinghu city,and 8 cases were aged ＞40 years.Six blood samples were collected,in which 5 were measles D8 virus positive and 1 was negative in measles virus detection.There were epidemiological links among 10 cases which occurred in a factory,a hospital and a family at the same time.There was no statistical difference in symptoms among cases caused by D8 virus and H1a virus.After the emergent measles vaccination,the measles outbreak was effectively controlled.Conclusion Untimely response due to the uneasy detection of measles cases in the early stage,nosocomial infection and weak barrier of measles immunity in adults might be the main reasons for this outbreak.Measles vaccination is effective in the prevention of measles D8 virus infection.It is necessary to strengthen measles genotype monitoring for the tracing of infection source and control of outbreaks.
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<p><b>OBJECTIVE</b>To determine measles antibody levels and influencing factors among children aged 6 to 15 years in Zhejiang province.</p><p><b>METHODS</b>Blood samples were collected from 2069 children aged 6 to 15 years in Changxing county (Huzhou) and Liandu district (Lishui) of Zhejiang province. Serum level of measles IgG antibody was measured using ELISA, and 800 mIU/mL was applied as the cut-off point of high antibody level. Chi-square or trend Chi-square test was used to analyze difference in positive rates of high antibody level among children with different characters, and the factors related to high antibody level in the vaccinated children were analyzed using multivariate logistic regression.</p><p><b>RESULTS</b>Among 2069 subjects, positive rate of high measles antibody level was 36.06% (746/2069). Multivariate logistic regression showed that the high measles antibody level was significantly associated with age of children and the age of first measles vaccine inoculation. The positive rate of high measles antibody level decreased with age(=0.866, 95%:0.830-0.904, <0.01), and the positive rate in children whose first vaccination at ≥ 12 months of age was higher than those whose first vaccination at 8 months of age(=0.633, 95%:0.498-0.805, <0.01).</p><p><b>CONCLUSIONS</b>In order to obtain high measles antibody level and to maintain high levels of population immune barrier, it is suggested that first dose of vaccination can be appropriately delayed in low epidemic areas, and elder children should have timely catch-up vaccination.</p>
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Adolescent , Child , Humans , Male , Antibodies, Viral , Enzyme-Linked Immunosorbent Assay , Immunoglobulin G , Measles , Measles Vaccine , VaccinationABSTRACT
OBJECTIVE@#To evaluate the cost/benefit of different vaccination strategies related to chickenpox vaccine.@*METHODS@#The direct economic cost and indirect economic cost caused by chickenpox were obtained through questionnaire survey. The epidemic characteristics of chickenpox in Zhejiang province were studied by literature review. Dynamic model was set up by Matlab software based on the parameters of chickenpox, to predict the incidence trends of chickenpox with different immunization strategies (no vaccination, 1-dose vaccination, 2-dose vaccination) in future 40 years (2017-2056). A cost-benefit analysis was conducted, and the sensitivities of the main parameters were analyzed.@*RESULTS@#Through the questionnaire survey of 105 cases, the direct and indirect economic cost per case was 506.84 Yuan and 1045.39 Yuan respectively, with the total of 1552.23 Yuan. During the prediction period (40 years), there would be 7.0908 million cases in strategy 2, which was 59.71% less than strategy 1 (17.5989 million cases). Total vaccination costs in strategy 2 were 2.366 billion Yuan, with a total economic gain of 33.741 billion Yuan and benefit/cost ratio (BCR) of 14.26:1. If strategy 3 was adopted, 2.7249 million chickenpox cases would occur, with a decrease of 84.52% compared with strategy 1. Total vaccination costs in strategy 3 was 4.495 billion Yuan, with a total economic gain of 44.309 billion Yuan and BCR of 9.86:1. Analysis showed that the vaccine price was the most sensitive variable, followed by the incidence of chickenpox in the absence of vaccine.@*CONCLUSIONS@#In Zhejiang province, one-dose strategy and two-dose strategy were both cost effective. It is suggested that the chickenpox vaccination should be included in the immunization program in Zhejiang province.
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Humans , Chickenpox , Chickenpox Vaccine , Cost-Benefit Analysis , Immunization Programs , Economics , Methods , Vaccination , EconomicsABSTRACT
Objective To evaluate the immunogenicity and safety of a booster dose of live attenua-ted measles-mumps-rubella (MMR) vaccine for 4-year-old children and to provide references for reasonable arrangement of MMR immunization schedule. Methods Children aged 4 years (54-60 months) old were recruited and divided into three groups as follows: Group 8 months MR [receiving live attenuated measles and rubella(MR) vaccination at 8 months and MMR vaccination at 18 months],Group 8 months MMR(re-ceiving MMR vaccination at both 8 and 18 months) and Group 12 months MMR(receiving MMR vaccination at both 12 and 22 months). Active follow-up was conducted for safety evaluation after immunization of all subjects with the booster dose of MMR vaccine. Blood samples were collected before and 35 days after vacci-nation and analyzed by ELISA to detect serum antibodies to measles,mumps and rubella. Results A total of 514 subjects were enrolled in this study of safety evaluation and 469 of them received serologic detection of antibodies twice. The rate of adverse reactions following vaccination was 17.12% (general reactions accoun-ted for 94.21%) and no severe adverse reactions were reported. No significant difference in the rates of ad-verse reactions was found among the three groups (χ2=4.82, P=0.090). Subjects who were seropositive for measles, mumps and rubella increased after immunization with MMR vaccine, accounting for 100%, 99.79% and 99.79%,respectively. Geometric mean concentrations (GMC) against measles, mumps and rubella in all subjects were 1.35,3.05 and 2.13 times higher than what they were before the immunization. Levels of antibodies to measles,mumps and rubella were all increased significantly in the three groups after immunization with the booster dose of MMR vaccine (Fisher Exact Test, P=0.000). Conclusion The booster dose of MMR vaccine increases the levels of serum antibodies in children aged 4 years old with high safety. It suggests that two doses of MMR vaccine should be encouraged in the immunization program in China.
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Objective@#To assess the 3-year antibody persistence after vaccination of domestic measles, mumps and rubella combined attenuated live vaccine (MMR) with different program.@*Methods@#Children from three different vaccination strategies (Group 8 m MR: 8 months and 18 months vaccinated with measles-rubella combined attenuated live vaccine and domestic MMR,respectively; Group 8 m MMR: 8 months and 18 months both vaccinated with domestic MMR; Group 12 m MMR: 12 months and 22 months both vaccinated with domestic MMR ) were followed up in Zhejiang province in July 2015. There were 170 participants in Group 8 m MR, 171 participants in Group 8 m MMR and 173 participants in Group 12 m MMR selected by simple random sampling method .Blood samples (venous blood 2-3 ml) were collected 1 month after the first dose vaccination of MMR (only in Group 8 m MMR and Group 12 m MMR) and 3 years (36-38 months) after the last dose vaccination of MMR and tested for antibody IgG against Measles, Mumps and Rubella using ELISA. Seropostive rate and Geometric mean concentration (GMC) were calculated and compared among different groups by Chi-square test or Fisher exact test and Kruskal-Wallis H test.@*Results@#A total of 514 participants (8 m MR: 170; 8 m MMR:171; 12 m MMR:173) were enrolled. The overall seropositivity rate of measles, mumps and rubella was 98.1% (504), 93.4% (480) and 88.1% (453), respectively, with corresponding GMC was 1 012.33 mU/ml, 502.87 U/ml and 50.53 U/ml respectively. There was no significant difference of seropositivity rate for measles among three groups (all groups were>97%). The highest seropositivity rate for mumps was found in the Group 12 m MMR with the rate of 98.8% (171/173), followed by Group 8 m MMR and Group 8 m MR with 93.0% (159/171) and 88.2%(150/170) respectively (Fisher exact test, P<0.001). The highest seropositivity rate for rubella was also found in the Group 12 m MMR with the rate of 94.8% (164/173), followed by Group 8 m MMR and Group 8 m MR with 86.6%(148/171) and 82.9%(141/170) respectively (Fisher exact test, P=0.002). The highest GMC of antibody against measles, mumps and rubella were all found in Group 12 m MMR, with 1 217.30 (1 119.35-1 323.82) mU/ml, 717.07 (643.83-798.65) U/ml and 62.54(56.21-69.58) U/ml respectively. The lowest GMC of antibody against measles and mumps were both in Group 12 m MR with 812.01 (734.52-897.67) mU/ml and 363.28 (305.42-432.11) U/ml respectively. The lowest GMC of antibody against rubella was in Group 8 m MMR with 44.10 (39.08-49.76) U/ml. These differences of GMCs among three groups were all reach significant means (P<0.05).@*Conclusion@#High level seropostive rates and GMCs were exist against measles and rubella after 3-year vaccination of domestic MMR among different program. Higher antibody level against mumps were found in those children with two doses vaccination of MMR.
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Objective To study the spatial-temporal dynamical features of measles in Zhejiang province.Methods Data was from the China Disease Surveillance Information System and China Immunization Program Information Management System.Power-law method on spatial-temporal-multicomponent model was used to analyze the epidemic characteristics of measles in the districts of Zhejiang province.Results The incidence of measles in Zhejiang province was 2.72/ 100 000 (1 494 cases) in 2013.Compared to the first order adjacent matrix,Power-law method showed a lower value of Akaike information criterion.The follow-up impact from the previous measles epidemic was strong to the Keqiao,Xiaoshan and Yuecheng districts with the autoregressive component as 1.39,0.88 and 0.77,respectively.Local risk of measles seemed high in Keqiao,Qujiang and Xiaoshan districts with the endemic component as 4.06,3.74 and 3.55,respectively.Impact of the epidemic to the nearby districts was large in Keqiao,Shangyu districts and Jiande city with epidemic components as 3.08,2.54 and 2.21,respectively.Conclusion The spatial-temporal feature of measles in several districts of Zhejiang province appeared heterogeneous,suggesting the specific strategies should be taken to control the epidemics of measles.
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Objective To investigate the methods used for evaluating the severity of the patients with acute pancreatitis induced by hyperlipidemia in order to find out some simple and practical biomarkers for predicting the severity of the illness.Methods Sixty-two patients with acute pancreatitis resulted from hyperlipidemia were selected from the in-patients of our hospital from January 2007 to July 2011 and were divided into two groups,namely the mild acute pancreatitis group(MAP,n =32)and the severe acute pancreatitis group(SAP,n =30)as per the Chinese Acute Pancreatitis Guideline.Two groups were comparable verified by the test of homogeneity of variance after grouping.Arterial blood gas analyses were done immediately after admission:Venous blood was taken from forearm for determining renal function and blood coagulation at 6 o＇lock of next day after admission.The data of base excess(BE),creatinine(CR),C-reactive protein(CRP),fibrin(FIB)and D-Dmmer(D-D)were documented.The contrast CT imaging of pancreas was done within 48 hours after admission in all patients.APACHE Ⅱ scores and computed tomography severity index(CTSI)were calculated.The differences in BE,CR,CRP,FIB and D-D between 2 groups were analyzed by using t-test,and the correlation among them and APACHE Ⅱ score and CTSI were analyzed by Spearman test done with SPSS 18.0 software.As BE ＜-4.5 mnol/L,CR ＞ 120μmol/L,CRP ＞ 100 mg/L,FIB ＞5.5 g/L and D-D 800 ng/L were set respectively as a positive screening criterion,positive prediction value(PPV),negative prediction value(NPV),sensitivity and specificity of each marker and combined markers were calculated after they were set at different positive scales in order to get the optimal predictors for evaluating the severity of acute pancreatitis induced by hyperlipidemia.Results The absolute values of BE,CR,CRP,FIB and D-D in group SAP were much higher than those in group MAP(P ＜ 0.01).Each of them had good correlation with APACHE Ⅱ score and CTSI,especially BE and D-D more significant.Each of them used separately for predicting the severity of acute pancreatitis showed PPV and NPV with high specificity but the sensitivity was hot high.The joint use of BE,CR and CRP,and joint use of FIB and D-D could be more valid as PPV and NPV with high specificity for predicting the severity of acute pancreatitis,but the sensitivity decreased.Conclusions BE,CR,CRP,FIB and D-D were good biomarkers for quickly and accurately evaluating and predicting the severity of the acute pancreatitis caused by hyperlipidemia.
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Objective To know the status of Immunization program in Zhejiang Province.Methods The investigation on immunization program in zhejiang province was conducted,and the SWOT analysis was corducted to make a comprehensive evaluation.Results 11 citys,22 counties and 44 towns were investigated in this study,and the current immunization program in Zhejiang province were explored by SWOT analysis.Conclusion The SWOT Matrix,includes SO(strength-opportunity),ST(strength-threat),WO(weakness-opportunity)and WT(weakness-threat)can apply to make optimal strategy for the development of expanded program on immunization.
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Objective To understand the distribution of medical resources in the various regions of Zhejiang so as to provide basis for furthering the rational allocation of health resources.Methods Using two-step cluster analysis based on intelligence cluster theories,medical resources in the 11 regions of Zhejiang were classified by calculating and comparing log-likelihood distances.Results The 11 regions were clustered into 4 different types of distribution according to AIC value,BIC value,and the principles of maximum distances and most optimal cluster and differentiation between the various types: type 1 included Hangzhou and Ningbo;type 2 included Zhoushan,Jinhua and Lishui;type 3 included Huzhou and Quzhou;type 4 included Wenzhou,Jiaxing,Shaoxing and Taizhou.Conclusion Medical resources in Zhejiang are unevenly distributed.The various regions there ought to take relevant measures to rationally allocate medical resources and improve the structure for the allocation of medical resources.