Seroepidemiology of varicella among elementary school children in northern Taiwan

Journal of Microbiology, Immunology, and Infection = Wei Mian Yu Gan Ran Za Zhi
Ming-Ru LinYhu-Chering Huang

Abstract

In Taiwan, varicella vaccine was included in the expanded program of immunization since 2004. A seroepidemiologic study in the postvaccine era is helpful to evaluate the efficiency of current varicella vaccination strategies. We used a multistage stratified systematic sampling design to classify 29 administrative districts of New Taipei City into five strata. In 2013, a total of 936 students from 14 primary schools were recruited and had blood drawn for serology tests for varicella-zoster virus-immunoglobulin-G via indirect chemiluminescence immunoassays. A history of clinical varicella and information on varicella vaccination status were obtained. Overall, the seroprevalence was 64.1%. For the five strata, the seropositive rate ranged from 54.2% (Stratum 5) to 71.7% (Stratum 2) with no significant difference. For each participating school, the seropositive rate ranged from 44.4% to 72.9% with a statistically significant difference (p < 0.005). For school children in each grade, seropositive rate increased significantly from 53.2% for Grade 1 to 71.8% for Grade 3 (p = 0.005) and increased steadily from 61.2% for Grade 4 to 71.2% for Grade 6 (p = 0.17). A positive correlation was observed between the seropositive rate and geomet...Continue Reading

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