Modelling the first dose of measles vaccination: the role of maternal immunity, demographic factors, and delivery systems.
Affiliation
Department of Ecology and Evolutionary Biology, Princeton University, NJ 0854, USA. cmetcalf@princeton.eduIssue Date
2011-02
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Epidemiology and InfectionAbstract
Measles vaccine efficacy is higher at 12 months than 9 months because of maternal immunity, but delaying vaccination exposes the children most vulnerable to measles mortality to infection. We explored how this trade-off changes as a function of regionally varying epidemiological drivers, e.g. demography, transmission seasonality, and vaccination coverage. High birth rates and low coverage both favour early vaccination, and initiating vaccination at 9-11 months, then switching to 12-14 months can reduce case numbers. Overall however, increasing the age-window of vaccination decreases case numbers relative to vaccinating within a narrow age-window (e.g. 9-11 months). The width of the age-window that minimizes mortality varies as a function of birth rate, vaccination coverage and patterns of access to care. Our results suggest that locally age-targeted strategies, at both national and sub-national scales, tuned to local variation in birth rate, seasonality, and access to care may substantially decrease case numbers and fatalities for routine vaccination.Publisher
Cambridge University PressPubMed ID
20525415Additional Links
http://journalseek.net/Type
ArticleLanguage
enISSN
1469-4409ae974a485f413a2113503eed53cd6c53
10.1017/S0950268810001329
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