Surveillance of antibody level of influenza among physical examination population of Shenzhen City from 2014 to 2018

ObjectiveTo provide the basis for influenza epidemic prevention and control by monitoring the antibody level of influenza among the general population in Dapeng New District of Shenzhen City.

MethodsA total of 1 350 serum samples of people were collected ten times from 2014 to 2018, and the antibody level was tested by hemagglutination-inhibition test.

ResultsDuring 2014-2018 years, only the positive rate of antibody to H3N2 was above 60%.The positive rates of H1N1, H3N2, BV and BY were 50.0%, 85.6%, 35.4% and 45.6%, respectively, and the geometric mean titers (GMT) of antibody were 8.2, 81.5, 3.9 and 6.4, respectively.Influenza antibody titers of 1 : 160 and 1 : 320 were mainly distributed in influenza H3N2.The antibody level of BV and BY in age group 0~4 years was 29.0% and 30.4% separately.

ConclusionIt is imperative to enhance the surveillance of antibody level of influenza among general population in Dapeng New District, to investigate the epidemic development trend of influenza constantly, and to prevent and control the outbreak of influenza epidemics.