We analyzed the evolutional and molecular characteristics of Hemagglutinin(HA),Neuraminidase(NA) and nonstructural(NS) genes of avian influenza A(H9n2) viruses from environment in poultry markets in Changsha,China,2014,providing laboratory data for prevention and control of human infection with avian influenza A(H9N2) virus.Five hundred and one specimens (263 poultry drinking water specimens,226 poultry sewage specimens and 17 others specimens) were collected from environment in poultry markets in Changsha,2014,and real-time RTPCR was used for influenza A typing and subtyping (H5,H7 and H9) detection.HA and NA universal primer sets for conventional RT-PCR and sequencing were used for the positivity of single H9.The sequence homology of HA,NA and NS genes of the viruses were analyzed with the online Basic Local Alignment Search Tool (BLAST).The ClustalW multiple alignments of amino acids and the phylogenetic trees for HA,NA and NS genes were constructed using the BioEdit and MEGA 5 software,respectively.Results showed that among 501 environmental samples,350 samples were positive for influenza A virus,191 (38.12％) for H9 subtype,177 (35.33％) for H5 subtype,11 (2.20％) for H7 subtype and 68 (13.57％) for H5 and H9 subtypes co-detection.Twenty-three H9N2 subtype AIV were confirmed by conventional RT-PCR and sequencing from the samples of the positivity of single H9.Phylogenetic analysis revealed that most of HA,NA and NS genes of the H9N2 subtype AIV isolated in Changsha City had gene constellations of genotype S,and these virues might have acquired their HA,NA and NS from A/Chicken/Shanghai/F/1998-like (H9N2).L235 (correspond to H3 numbering 226) of the HA protein of the receptor binding site (RBS) were found in these H9N2 viruses,and the characteristics was shown to be associated with increased affinity of HA to the glycan-receptors of human influenza virus,and the low pathogenicity molecular characteristics of HA,NA and NS genes were showed in these viruses.The positive rate of nucleic acid of the H9 subtype of avian influenza virus from environment was the highest in poultry markets in Changsha,2014,and molecular characteristics of the HA,NA and NS of these H9N2 subtype AIV showed low pathogenicity,but that may facilitate human infection.So,the prevalence and genetic evolution of this virus should be closely monitored.

Objective To analyze the transmission pattern of Chikungunya (CHIK) fever in community and evaluate the effectiveness of mosquito control, case isolation and other key control measures by using ordinary differential equation (ODE) model.Methods According to natural history of CHIK, an ODE model for the epidemiological anaysis of CHIK outbreak was established.The key parameters of the model were obtained by fitting the model with reported outbreak data of the first CHIK outbreak in China.Then the outbreak characteristics without intervention, the effectiveness of mosquito control and case isolation were simulated.Results Without intervention, an imported case would cause an outbreak in a community with population of 11 000, and cumulative case number would exceed 941 when the total attack rate was 8.55％.The results of our simulation revealed that the effectiveness of case isolation was not perfect enough when it was implemented alone.Although the number of cases could be decreased by case isolation, the duration of outbreak would not be shortened.Differently, the effectiveness of mosquito control was remarkable.In addition, the earlier the measure was implemented, the better the effectiveness would be.The effectiveness of mosquito control plus case isolation was same with mosquito control.Conclusion To control a CHIK outbreak, mosquito control is the most recommended measures.However, case isolation is also necessary as the supplementation of mosquito control.

OBJECTIVE: To determine the prevalence and incidence of illness of two-week duration, and the factors influencing these, among residents 15 years and older in four counties of Hunan Province. METHODS: Data were sampled from four counties of Hunan Province for the Fourth National Health Service Survey. Incidence and two-week prevalence of disease were used to assess the health service needs of residents. A non-conditional, stepwise logistic regression was employed to explore the influencing factors. RESULTS: The two-week prevalence and incidence were 11.5% and 3.9%, respectively, in four counties of Hunan. The three leading diseases of two-week prevalence were: respiratory diseases, digestive diseases, and musculoskeletal diseases. Non-conditional stepwise logistic regression showed that urban residents had 0.64 times the risk of two-week illness compared with the rural residents (P< 0.05); residents in the 45-59 year age group and the 60+ year age group had 1.69 and 2.62 times the risk of two-week illness compared with residents in the 15-44 year age group, respectively (P<0.05). The widowed had 1.91 times the risk of prevalence of two-week illness contrasted to singles (P<0.05); the students had 0.29 times the risk of two-week illness contrasted to the workers (P<0.05); urban residents had 0.63 times the risk of two-week illness compared with the rural (P<0.05); the widowed had 2.37 times the risk of incidence of two-week illness compared with singles (P<0.05). CONCLUSION The majority of health service needs of residents of four counties is generated by three diseases: respiratory diseases, digestive diseases, and musculoskeletal diseases. Relatively, rural residents, the elderly, employed persons and the widowed have higher health service needs than others and deserve specific attention.
Adolescent ; Adult ; Aged ; China ; epidemiology ; Community Health Services ; statistics & numerical data ; Digestive System Diseases ; epidemiology ; Female ; Humans ; Incidence ; Male ; Middle Aged ; Musculoskeletal Diseases ; epidemiology ; Respiratory Tract Diseases ; epidemiology ; Sampling Studies ; Surveys and Questionnaires ; Young Adult

Objective To predict the burden caused by fatal road traffic injuries from 2015 to 2030. Methods We searched the websites of United Nations Population Division,United States Department of Agriculture,World Health Organization,China Energy Research Foundation and other agencies to obtain the predictive values of gross domestic product(GDP)per capita,urbanization, motorization and education from 2015 to 2030 in China. Predicted values were then applied to log-linear models to estimate the numbers and years of life lost due to road traffic injuries from 2015 to 2030. Results The mortality rate caused by road traffic injury decreased slightly,from 13.7/100 000 in 2015 to 11.8/100 000 in 2030. 191,189,183,169 thousand persons were estimated to die from road traffic crashes in 2015,2020,2025 and 2030,respectively,showing a declining trend. Years of Life Lost(YLLs)caused by road traffic deaths were predicted to be 6 918,6 634,6 189,5 513 thousand years in 2015,2020,2025 and 2030,respectively,also showing a gradual downward trend. But the YLLs displayed an increase among people at 55 years of age or older,between 2015 and 2030. Results from the sensitivity analysis showed a stable forecasting result. Conclusion Mortality, number of deaths and YLLs from road traffic crashes were predicted to decrease slightly,between 2015 and 2030 but the number of deaths and YLLs due to road traffic injuries will continue to increase from 2015 to 2030.

As 2019-nCoV vaccine is widely used in the adult population, children and adolescents have gradually become an important susceptible population to 2019-nCoV due to their low coverage of the vaccine and high contact degree. Understanding the characteristics of 2019-nCoV infection in minors is vital. This paper summarized the progress in the research of 2019-nCoV in minors by using the data from the retrieval of recently published literature. Furthermore, the key characteristics of 2019-nCoV infection in minors, including the susceptibility, transmissibility, prognosis and immune response were analyzed and the progress in child and adolescent vaccine development was introduced.

OBJECTIVETo predict the burden caused by fatal road traffic injuries from 2015 to 2030.

METHODSWe searched the websites of United Nations Population Division,United States Department of Agriculture, World Health Organization, China Energy Research Foundation and other agencies to obtain the predictive values of gross domestic product (GDP) per capita, urbanization, motorization and education from 2015 to 2030 in China. Predicted values were then applied to log-linear models to estimate the numbers and years of life lost due to road traffic injuries from 2015 to 2030.

RESULTSThe mortality rate caused by road traffic injury decreased slightly, from 13.7/100 000 in 2015 to 11.8/100 000 in 2030. 191, 189, 183, 169 thousand persons were estimated to die from road traffic crashes in 2015, 2020, 2025 and 2030, respectively, showing a declining trend. Years of Life Lost (YLLs) caused by road traffic deaths were predicted to be 6 918, 6 634, 6 189, 5 513 thousand years in 2015, 2020, 2025 and 2030, respectively, also showing a gradual downward trend. But the YLLs displayed an increase among people at 55 years of age or older, between 2015 and 2030. Results from the sensitivity analysis showed a stable forecasting result.

CONCLUSIONMortality, number of deaths and YLLs from road traffic crashes were predicted to decrease slightly, between 2015 and 2030 but the number of deaths and YLLs due to road traffic injuries will continue to increase from 2015 to 2030.

Accidents, Traffic ; mortality ; Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; China ; epidemiology ; Cost of Illness ; Female ; Humans ; Infant ; Infant, Newborn ; Male ; Middle Aged ; Young Adult

OBJECTIVE: To explore the toxicological mechanism of drug-induced liver injury(DILI) in rats induced by cantharidin(CTD). METHODS: SD rats were exposed to different doses of CTD(0.061 4, 0.092 1, 0.184 1 mg·kg−1) by oral gavage for 28 d. Liver index and serum liver function indictors were detected. HE staining was used to evaluate the pathological changes of liver. Then the proteins in endoplasmic reticulum stress(ERS), autophagy, and apoptosis-pathway were detected by Western blotting. RESULTS: The liver index was increased in CTD groups. The ALT, AST, LDH, ALP and T-Bil were increased by CTD with a dose-dependent manner. Disrupted hepatic architecture and dilatation of central vein were observed after CTD intervention. The protein expression levels of GRP78, CHOP, ATF4, Beclin-1, LC3, Caspase-3, Caspase-8, and Bax/Bcl-2 were increased after CTD intervention. Molecular docking results revealed that GRP78, ATF4, and Beclin-1 could directly interconnect with CTD. CONCLUSION CTD can activate ERS, autophagy and synergistically inducing downstream apoptosis in rat, providing a novel insight into the mechanism of CTD-induced DILI.