Flutrop CIRAD Avian Influenza

Proceedings of the OIE/FAO/ IZSVe international conference on Vaccination, a tool to control avian influenza, Verona, Italy, March 20-22 2007

Authors and affiliations

Peyre M (1), Desvaux S (2), Vu Dinh T (3), Phan Dang T (3), Renard JF (1), Roger F (1)

(1) CIRAD, F-34398 Montpellier, France
(2) French Agricultural Research Center for International development(CIRAD), PRISE Consortium in Vietnam, National Institute of Veterinary Research, Hanoï, Vietnam
(3) Centre for interdisciplinary research on rural development (CIRRD), Hanoï agricultural university, Hanoï, Vietnam

Astract

Highly Pathogenic Avian Influenza caused by H5N1 virus has become endemic in some developing countries and millions of birds have been culled with large economical and sociological impacts. Since the end of the first vaccination campaign in Vietnam (Nov-Dec 2005) no new outbreaks in domestic poultry have been reported. However, the virus is still circulating as confirmed by routine surveillance programs. Vaccination is a useful tool to be used to eradicate the disease, but the cost-benefit impact of different strategy needs first to be addressed. Cost and outcome of a vaccination campaign depend on the vaccination coverage rate and on the number of doses administered. The choice of a vaccination strategy depends on the epidemiologic context and is function of the available vaccine type (inactivated or vectored), the targeted species (chicken, ducks, geese…) and the targeted poultry production sector (breeders, layers, broilers). Here a conceptual framework on the cost-benefit evaluation of various vaccination strategies is presented. This preliminary stochastic model integrates all the variables linked to a vaccination campaign as described above and is based on preliminary data obtained from international databases and field missions carried out in Vietnam. Descriptive and participative epidemiology will be used to collect data at farm and provinces levels in order to further parameter and validate this model. An extrapolation of this model at a national level could be used by decision makers to evaluate and compare different vaccination strategies based on their cost-benefit ratio.