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Varicella-zoster virus seroprevalence in children and adolescents in the pre-varicella vaccine era, Germany.
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- Author(s): Wiese-Posselt, Miriam; Siedler, Anette; Mankertz, Annette; Sauerbrei, Andreas; Hengel, Hartmut; Wichmann, Ole; Poethko-Müller, Christina
- Source:
BMC Infectious Diseases; 5/19/2017, Vol. 17, p1-9, 9p, 2 Diagrams, 4 Charts, 1 Graph- Subject Terms:
- Source:
- Additional Information
- Abstract:
Background: In 2004, universal childhood varicella vaccination was introduced in Germany. We aimed to determine the age-specific prevalence of anti-varicella zoster virus (VZV) IgG-antibodies among children in the pre-varicella vaccine era in Germany, to identify factors associated with VZV seropositivity, and to assess the suitability of a commercially available ELISA for VZV seroepidemiological studies by comparing it with an in-house fluorescent antibody to membrane antigen test (FAMA) as the gold standard.Methods: Serum samples of 13,433 children and adolescents aged 1-17 years included in the population-based German Health Interview and Examination Survey for Children and Adolescents (KiGGS; conducted 2003-2006) were tested for anti-VZV IgG by ELISA. All samples with equivocal ELISA results and a random selection of ELISA-negative and -positive samples were tested by FAMA. Statistical analyses were conducted using a weighting factor adjusting the study population to the total population in Germany. Seroprevalences were calculated as percentages (%) with a 95% confidence interval (CI). Odds ratios (OR) were computed by multivariate logistic regression to determine the association between socio-demographic factors and VZV seropositivity.Results: The VZV seropositivity rate was 80.3% (95% CI: 79.3-81.3) in varicella-unvaccinated children and adolescents. VZV seropositivity rates differed significantly between age groups up to age 6 years, but not by gender. Of 118 retested serum samples with an equivocal ELISA result, 45.8% were FAMA-positive. The proportion of samples tested as false-negative in by ELISA varied by age group: 2.6% in children aged 1-6 and 9% in children aged 7-17 years. Multivariate analyses showed that age, having older siblings, and early daycare start were associated with seropositivity in preschoolers; migration background reduced the chance of VZV seropositivity in schoolchildren (OR: 0.65; 0.43-0.99) and adolescents (OR: 0.62; 0.4-0.97).Conclusion: In the pre-varicella vaccine era, most children in Germany contracted varicella by age six. Schoolchildren with a migration background and children without siblings have an increased risk of being VZV seronegative and should be targeted for catch-up vaccination, if they have no history of chickenpox. ELISAs are suitable for use in population-level serosurveys on VZV, but samples with equivocal ELISA results should be retested by FAMA. [ABSTRACT FROM AUTHOR] - Abstract: Copyright of BMC Infectious Diseases is the property of BioMed Central and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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