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dc.contributor.authorLesnoff, M.
dc.contributor.authorPeyre, M.
dc.contributor.authorDuarte, P.C.
dc.contributor.authorRenard, J.F.
dc.contributor.authorMariner, Jeffrey C.
dc.date.accessioned2009-10-30T08:18:48Z
dc.date.available2009-10-30T08:18:48Z
dc.date.issued2009-02-22
dc.identifier.citationLesnoff, M., Peyre, M., Duarte, P.C., Renard, J.-F. and Mariner, J.C. 2009. A simple model for simulating immunity rate dynamics in a tropical free-range poultry population after avian influenza vaccination. Epidemiology and Infection 137(10): 1405-1413.en_US
dc.identifier.urihttp://hdl.handle.net/10568/37
dc.description.abstractIn developing countries, vaccination against highly pathogenic avian influenza subtype H5N1 (HPAI) in free-range poultry flocks is usually implemented as periodic campaigns and newborn chicks are generally not vaccinated by farmers between vaccination passes. The demographic population turnover leads to a continuous decrease in the population immunity rate (PIR) over time. We present a simple Leslie matrix model for estimating population turnover and PIR dynamics in a hypothetical small-size vaccinated free-range poultry population. Four different vaccination scenarios were identified assuming necessary procedures to achieve immunity. The results indicate that high levels of population immunity are difficult to sustain. Assuming an animal immunity response of 80% after vaccination and a constant population size, PIR 4 months after vaccination was 30% in all the scenarios. Predictions averaged over time showed mean PIR between 36% and 48%, which is below the population immunity thresholds for eradication approximated from R0 estimates.en_US
dc.language.isoenen_US
dc.sourceEpidemiology and infectionen_US
dc.subjectPOULTRYen_US
dc.subjectFREE RANGE HUSBANDRYen_US
dc.subjectAVIAN INFLUENZA VIRUSen_US
dc.subjectIMMUNITYen_US
dc.titleA simple model for simulating immunity rate dynamics in a tropical free-range poultry population after avian influenza vaccinationen_US
dc.typeJournal Articleen_US
cg.subject.ilriDISEASE CONTROLen_US
cg.subject.ilriVACCINESen_US
cg.identifier.statusLimited Accessen_US
cg.identifier.doihttps://dx.doi.org/10.1017/S0950268809002453


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