Cross-Sectional Surveys of Measles Antibodies in the Jiangsu Province of China from 2008 to 2010: The Effect of High Coverage with Two Doses of Measles Vaccine among Children |
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Authors: | Yuanbao Liu Peishan Lu Ying Hu Zhiguo Wang Xiuying Deng Fubao Ma Hong Tao Chengmei Jia Xiaoyan Ding Haitao Yang Pei Liu Jie Min |
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Affiliation: | 1. Department of Expanded Programme on Immunization, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu Province, China.; 2. Department of Biostatistics and Epidemiology, School of Public Health, Southeast University, Nanjing, Jiangsu Province, China.; The University of Adelaide, Australia, |
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Abstract: | BackgroundChanges in the epidemiological characteristics of measles since 2007 appeared in the Jiangsu province. Although the reported coverage with two doses of measles vaccine was greater than 95% in most regions of the province, measles incidence remained high across the whole province. Cross-sectional serological surveys of measles antibodies in the Jiangsu province of China were conducted from 2008 to 2010 to assess and track population immunity.MethodsMeasles-specific IgG levels were measured in serum samples using ELISA. GMTs and seroprevalence with 95% CIs were calculated by region, gender, and age. ANOVA and χ2 tests were used to test for statistically significant differences between groups for GMT levels and seroprevalence, respectively.ResultsSeroprevalence showed a significantly increasing trend annually (CMH χ2 = 40.32, p<0.0001). Although the seroprevalence among children aged 2–15 years was consistently over 95%, vaccine-induced measles antibodies may wane over time. Measles seropositivity in the Jiangsu province was 91.7% (95% CI: 90.1–93.2%) in 2010. Among adults aged 15 to 29-year-olds, the seropositivity rate was 88.4% (95% CI: 82.7–92.8%).ConclusionsVaccination strategies may need to be adjusted depending on the individual age and regions, particularly individuals between the ages of 8 months-14 years old and 20–29 years old. Additional SIAs are likely required to eliminate measles in China. |
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