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Objective:To understand the clinical characteristics of pregnant women infected with dengue virus (DENV) in Ruili City, Yunnan Province, so as to provide basis for formulating effective diagnosis and treatment protocol of dengue fever in pregnant women.Methods:A total of 18 pregnant women infected with DENV hospitalized in Ruili People's Hospital in 2017 and 2018 were selected as observation group, and 18 non-pregnant women infected with DENV were selected as control group according to the age range of the observation group, and epidemiological and clinical data of patients in the two groups were retrospectively collected. Epidemiological characteristics, clinical symptoms and laboratory biochemical indexes of the two groups were compared and analyzed.Results:There were no significant differences ( t = - 0.032, 0.495, P > 0.05) in age [(27.9 ± 5.3) vs (27.9 ± 5.1) years old] and hospitalization stay [(6.8 ± 1.6) vs (6.6 ± 2.0) d] between the observation group and control group. One pregnant woman in observation group had early pregnancy abortion. Patients of both groups had fever in 18 cases (100.0%), headache, muscle aches, and chills in 14 cases (77.8%), anorexia in 15 cases (83.3%), and nausea and vomiting in 5 cases (27.8%); fatigue in 14 cases (77.8%) and 16 cases (88.9%), respectively; there was 1 case of rash in observation group (5.6%), and no rash in control group. There were no significant differences in the above mentioned clinical symptoms distribution between the two groups ( P > 0.05). On the first day of admission, the reduction proportions in red blood cells [61.1% (11/18) vs 5.6% (1/18)], hemoglobin [50.0% (9/18) vs 16.7% (3/18)], and hematocrit [61.1% (11/18) vs 16.7% (3/18)] in observation group were significantly higher than those in control group ( P < 0.05); on the fifth day of admission, the reduction proportions in hemoglobin [33.3% (6/18) vs 5.6% (1/18)] and hematocrit [33.3% (6/18) vs 5.6% (1/18)] in observation group were significantly higher than those in control group ( P < 0.05). Conclusions:The red blood cells, hemoglobin and hematocrit of pregnant women infected with DENV are significantly reduced, and there is a risk of miscarriage in early pregnancy. It is suggested that relevant departments should strengthen the training of medical staff to diagnose and treat pregnant women infected with DENV early.
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Objective@#To study the clinical features of dengue cases infected with hepatotropic virus and Mycobacterium tuberculosis in Xishuangbanna, and to provide evidences to set up effective treatment programs for the dengue patients infected with the other diseases for hospitals.@*Methods@#The clinical characteristics of dengue cases infected hepatotropic virus and Mycobacterium tuberculosis were analyzed retrospectively on their symptoms and biochemical parameters from the People′s Hospital and the Infectious Disease Hospital of Xishuangbanna Prefecture in 2013 and 2015.@*Results@#The clinical characteristics of dengue cases infected with hepatotropic virus were typical, and inclued low incidence of urinary abnormalities, coagulation disorders and high-lactate dehydrogenase. Dengue cases infected with Mycobacterium tuberculosis had high incidence of shock, high-hematocrit, renal function and coagulation abnormalities, which suggested a trend of more serious illness than other groups obviously.@*Conclusions@#The rate of severe disease was higher in dengue cases infected with Mycobacterium tuberculosis than those infected with hepatotropic virus, which suggests that the dengue cases infected with Mycobacterium tuberculosis should be treated timely to reduce the severity of the diseases in the hospital.
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Objective@#To investigate the distribution patterns of arboviruses in Yunnan province near the China-Laos-Myanmar border, China, and to provide evidence for prevention and control of arboviruses diseases.@*Methods@#Mosquito samples were collected in Daluo county of Xishuangbanna Dai Autonomous Prefecture and Zhengdong county of Pu’er city in Yunnan province, 2012. Viruses were isolated from the samples by tissue culture, positive isolates were identified by RT-PCR with arbovirus species-specific primers, for further sequencing and phylogenetic analysis.@*Results@#A total of 17 species of mosquitoes from 6 genera were collected. A total of 24 strains of viruses were isolated from the mosquito pools and identified as Tembusu virus (TMUV) (2 strains), Japanese encephalitis virus (JEV) (3 strains), Getah virus (GETV) (2 strains), Banna virus (BAV) (4 strains), Densovirus (DNV) (9 strains) and Nam Dinh virus (NDiV) (3 strains).@*Conclusions@#The China-Laos-Myanmar border of Yunnan province is rich in species of mosquitoes and arboviruses.
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<p><b>OBJECTIVE</b>To understand the molecular characteristics of a dengue virus outbreak in China-Myanmar border region, Yunnan province, 2015 and provide etiological evidence for the disease control and prevention.</p><p><b>METHODS</b>Semi-nested RTPCR was conducted to detect the capsid premembrane (CprM) gene of RNA of dengue virus by using dengue virus NS1 positive serum samples collected in Mengdin township, Gengma county, Yunnan province in July, 2015. Some positive samples were then detected by using PCR with specific primers to amplify the full E gene. The positive PCR products were directly sequenced. Then sequences generated in this study were BLAST in NCBI website and aligned in Megalign in DNAstar program. Multiple sequence alignments were carried out by using Mega 5.05 software based on the sequences generated in this study and sequences downloaded from GenBank, including the representative strains from different countries and regions. Phylogenetic trees were constructed by using Neighbor-Joining tree methods with Mega 5.05 software.</p><p><b>RESULTS</b>Twenty one of 25 local cases and 10 of 14 imported cases from Myanmar were positive for DENV-1. Eight serum samples were negative for dengue virus. A total of 13 strains with E gene (1485 bp), including 8 local strains and 5 imported strains, were sequenced, which shared 100% nucleotide sequence identities. Twelve strains with CprM gene (406 bp) from 9 local cases and 3 imported cases shared 100% nucleotide sequence identities. Phylogenetic analyses based on E gene showed that the new 13 strains clustered in genotype I of dengue virus and formed a distinct lineage.</p><p><b>CONCLUSIONS</b>This outbreak was caused by genotype I of DENV-1, which had the closest phylogenetic relationships with dengue virus from neighboring Burma area. Comprehensive measures of prevention and control of dengue fever should be strengthened to prevent the spread of dengue virus.</p>
Subject(s)
Humans , Capsid Proteins , China , Epidemiology , DNA Primers , Databases, Nucleic Acid , Dengue , Epidemiology , Virology , Dengue Virus , Genetics , Disease Outbreaks , Genotype , Myanmar , Epidemiology , Phylogeny , Polymerase Chain Reaction , Sequence Alignment , SoftwareABSTRACT
Objective To understand the status of Toxoplasma gondii infection in the population of Pu er City so as to pro-vide the evidence for formulating the strategy of toxoplasmosis control. Methods The population from Jingdong Jinggu and Menglian counties in Pu er City was surveyed IgG of T. gondii in serum was detected by ELISA. Results Totally 906 resident serum samples were detected and the IgG positive rate was 24.2%. The positive rates were higher in the aged groups of 30-39 years and 60-69 years and the difference among different aged groups was significant χ2=17.77 P 0.01 . There were no si-gnificant differences between different sexualities and among different educational levels and living habits P 0.05 . The posi-tive rates were 26.6% 194/730 15.5% 22/142 and 8.8% 3/34 in farmers students and other occupations respectively and there was a significant difference among them χ2=12.51 P 0.01 . The positive rates were 23.3% 198/849 and 36.8%21/57 in the farmers who had the habit of rearing pigs in pens and the farmers who had the habit of free ranging pigs respec-tively and there was a significant difference between them χ2=5.33 P 0.05 . Conclusion The IgG positive rate of T. go-ndii is very high in Pu er City and therefore the health education for toxoplasmosis control should be strengthened.
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Objective To establish the molecular identification of five members in Anopheles maculatus complex from China. Methods Different rDNA-ITS2 regions of An. maculatus complex were sequenced and analyzed. The species specific primers were designed, and PCR assay was used for the identification. Results The length and GC contents of ITS2 were 328 bp, 58.54% in An. pseudowillmori, 330 bp, 57.85% in An. maculatus, 337 bp, 59.05% in An. willmori, 334 bp, 58.68% in An. dravidicus, and 338 bp, 57.69% in An. sawadwongporni, respectively. The intra-species ITS2 sequences were conservative. The ranges of divergence level among five members were from 9.7% to 18.9% . Five distinct specific fragments were amplified by PCR assay using five species specific primers and 5. 8S primer. The length was 119, 186, 231, 327 and 406 bp respectively. Conclusion The diagnostic PCR assay based on ITS2 divergence to distinguish five members of An. maculatus complex was simple and reliable.
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Objective To interpret genetic variation and population structure of Anopheles dirus A and D from China by molecular marker. Methods Samples included An. dirus A of Hainan laboratory colony (n=13), and field specimen from Mengla (n=17) and Jiangcheng (n=17) in Yunnan Province. The specimens were identified by PCR assay before study. mtDNA-COⅠ region was amplified and sequenced. Genetic variation and population structure was estimated according to sequence data. Results The mtDNA-COⅠ gene with a length of 959 bp was analyzed. There were three haplotypes in An. dirus A and six haplotypes in An. dirus D. The above haplotypes distributed in three populations unif-ormly. The average number of pairwise differences within Mengla population (7.441 2) was greater than that of Jiangcheng (1.279 4) and Hainan (1.051 3) populations, which suggested that the level of genetic divergence was the highest within Mengla population. The result of hierarchical AMOVA estimation showed a limited geneflow (Fst=0.799 9), therefore the variation level in a population (20.01%) was smaller than among the populations (79.99%). Conclusion The inter-specific genetic variation between An. dirus A and D in China was small and the level of divergence among individuals was high.
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Objective To detect circumsporozoite protein (CSP) in anopheline vectors from south Yunnan and to evaluate ELISA in the detection. \ Methods\ Salivary glands of the anopheline mosquitoes were taken for finding sporozoites by microscopy and part of the glands was used for detecting CSP by ELISA. An. minimus was experimentally infected by blood from vivax malaria patient (with Plasmodium vivax) and examined for sporozoites and CSP. Eight species of anopheline mosquitoes were caught in the field and examined. Monoclonal antibodies to P.falciparum (Pf2A10) and P.vivax (Pv210, Pv247) were used in ELISA for detecting CSP. \ Results\ Sporozoites were found in the salivary glands of 27 out of 36 An. minimus experimentally infected (75^0%), 29 were ELISA CSP positives (80^6%), and 26 of the 27 mosquitoes showed Pv210 CSP positive. Among \{1 010\} parous anopheline mosquitoes from the field, 7 were found sporozoite positive (0^69%), 8 were ELISA CSP positive (0^79%), and 6 of the 7 mosquitoes showed CSP positive. Of \{4 675\} wild mosquitoes in 8 anopheline species with different ages, 11 were found CSP positive (0^24%) including An.minimus, An.sinensis and An.maculatus with a positive rate of 0^20%, 0^24% and 0^39% respectively.Among the 11 mosquitoes, 9 were Pv210 positive and 2 were Pf2A10 positive. Conclusion CSP detection by ELISA is a useful method to monitor the malaria transmission capacity of anopheline vectors.