ObjectiveTo understand the epidemiological characteristics of norovirus infection in Nanning and provide scientific evidence for the prevention and control of norovirus infection.
MethodsThe test results of norovirus infection epidemics, case information and 3 epidemic investigation reports in Nanning from January 2015 to January 2019 were collected for statistical analysis.
ResultsA total of 51 norovirus epidemics were laboratory confirmed. The epidemics occurred in 2016 and 2017 accounted for 62.75%, and the epidemic caused by norovirus GⅡ accounted for 90.20%, and the epidemics caused by norovirus GⅠ and GⅡ accounted for 9.80%. The incidence was high during September-January. Two incidence peaks with different intensities were found. The epidemics mainly occurred in Qingxiu, Binyang, Jiangnan and Xingning districts, where the reported epidemics accounted for 68.63%. Twenty five epidemics occurred in child care settings, accounting for 49.02%. There was no significant difference in positive rate between males and females. The clinical symptoms were mainly vomiting and diarrhea. In 481 case samples, 289 samples of asymptomatic persons and 36 water samples, the positive rates of norovirus were 60.50%, 8.30%, and 16.67%, respectively. The transmission routes of 48 epidemics were unknown, accounting for 94.12%.
ConclusionNorovirus GⅡ was the major pathogen causing norovirus epidemics in Nanning. Autumn and winter were the seasons with high incidences, showing the incidence peaks synchronized with the epidemics occurred both at home and abroad. It is necessary to pay attention to the prevention and control of norovirus infection in areas or settings with high-incidences, strengthen health education, improve the power of epidemic response for the rapid identification of infection source of infection and blocking the transmission route and conduct norovirus gene sequencing to identify epidemic genotypes and detect variants or recombinant strains in time.
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