Forensic Validation and Application Evaluation of IDentifier DNA Typing Kit (Yan-Huang34) / 法医学杂志

OBJECTIVES@#To investigate the technical performance of IDentifier DNA typing kit (YanHuang34) and evaluate its forensic application value.@*METHODS@#Following the Criterion of Forensic Science Human Fluorescence STR Multiplex Amplification Reagent (GB/T 37226-2018), IDentifier DNA typing kit (YanHuang34) was verified in 11 aspects of species specificity, veracity, sensibility, adaptability, inhibitor tolerance, consistency, balance, reaction condition verification, mixed samples, stability and inter batch consistency. The system efficiency of IDentifier DNA typing kit (YanHuang34) was compared with the PowerPlex® Fusion 6C System, VersaPlex® 27PY System and VeriFilerTM Plus PCR Amplification Kit. The IDentifier DNA typing kit (YanHuang34) was used to detect the swabs of biological samples in daily cases and the STR performances were observed.@*RESULTS@#IDentifier DNA typing kit (YanHuang34) had good species specificity, veracity, adaptability, inhibitor tolerance and balance. The sensibility was up to 0.062 5 ng. It was able to detect different types of samples, degraded samples and inhibitor mixed samples. Complete DNA typing could be obtained for samples with the mixture ratio less than 4∶1. The system efficiency of IDentifier DNA typing kit (YanHuang34) was very high, with TDP up to 1-1.08×10-37, CPEtrio and CPEduo up to 1-5.47×10-14 and 1-6.43×10-9, respectively. For the touched biological samples in actual cases, the effective detection rate was 21.05%. The system efficiency of kinship, single parent and full sibling identifications was effectively improved.@*CONCLUSIONS@#The IDentifier DNA typing kit (YanHuang34) is adaptive to the GB/T 37226-2018 requirements. It can be used for individual identification and paternity identification, and is suitable for application in the field of forensic science.

Epidemiological characteristics of malaria before and after the elimination in Hangzhou / 预防医学

Objective To compare the epidemiological characteristics of malaria before and after the elimination in Hangzhou, and to provide scientific basis for formulating malaria control strategies. Methods We collected the data of confirmed malaria cases in Hangzhou from 2005 to 2016. We compared the differences in epidemiological characteristics (demographic features of malaria cases, source of infection, plasmodium species, etc.) and vectors of malaria before (2005-2010) and after (2011-2016) the elimination of malaria. Results Totally 340 malaria cases were reported before the elimination in Hangzhou with the annual incidence rate of 0.16/10 million, while 227 cases were reported after the elimination with the annual incidence rate of 0.25/10 million. Local cases accounted for 11.47% before the elimination, while no local cases but all imported cases were reported after the elimination. Compared the sex, occupation and age of malaria cases, epidemic season, report area, source of infection and species before and after the elimination, the proportion of men increased from 67.65% to 89.87%; the proportion of 18-60 years old group increased from 75.88% to 96.04%; the proportion of children / students decreased from 17.35% to 7.49%;the epidemic season changed from July to October to no obvious season; the main report area changed from suburb (55.88%) to urban area (81.06%); the source of infection changed from the domestic provinces (77.94%) to foreign countries (99.12%) ;the main species of malaria parasites changed from vivax malaria (88.24%) to ciparum malaria (71.81%) . The Anopheles mosquitoes caught by vector monitoring were Anopheles sinensis. The average density of Anopheles sinensis before and after the elimination was 10.0 and 5.0 /(person·night) . Conclusion After the elimination of malaria in Hangzhou, imported malaria cases from abroad were dominant. and the men and women who returned to and from abroad and 18-60 years old were the key prevention and control groups in the future.The epidemiological characteristics of malaria after the elimination in Hangzhou have changed greatly. The men who are 18-60 years old and return from abroad are the focus of malaria prevention and control.

A retrospective analysis on the epidemic of human and livestock brucellosis and the prevention and control measures in Zhejiang Province / 预防医学

Objective To analyze the epidemic situation of human and livestock brucellosis in Zhejiang Province in recent sixty years and to put forward countermeasures for prevent and control.Methods Related data of prevention and cure of human and livestock brucellosis were collected from 1 996 to 201 4 and descriptive analysis was conducted.Results The positive rate of the livestock's bacteria was up to 22. 28%in the history of Zhejiang Province.Epidemic foci of B.canis and B.bovis in Zhejiang Province were confirmed.After achieving stability control standards of brucellosis,the positive rate of livestock brucellosis was low.But in recent years,meat goats from the north and local sheep have been detected positive for brucellosis in many places.The first case of brucellosis in Zhejiang Province was confirmed in 1 967.But only in the occupational population,there were sporadic cases of chronic stable type or occult infection.A total of 506 brucellosis cases have been reported and 767 new infections have been detected since the reappear of human brucellosis in 2003.The annual report incidence rate was increasing(χ2trend =9. 533,P=0. 002).There were nine cases of human brucellosis outbreak, occurring in Shaoxing,Hangzhou,Ningbo,Jinhua,Jiaxing and Quzhou City respectively.In the human or the animal, there were five biotypes and a total of 82 strains were detected.The dominant strains of Brucella was B .melitensis type 3. Conclusion At present the epidemic of livestock brucellosis in Zhejiang Province is mainly imported.The human epidemic mainly associated with input focus by livestock.With the increasing input of foreign sheep year by year ,human epidemic is at risk and there is a risk of proliferation.Therefore,we should strengthen the joint prevention and control of brucellosis and health and animal husbandry departments should take comprehensive prevention and control measures to fight against human and livestock brucellosis together.