Efficiency of rabies oral vaccination in foxes
2004
Olsevskis, E.(Food and Veterinary Service, Riga (Latvia)) | Liepins, E.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine. Inst. of Food and Environmental Hygiene) | Trubka, R.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine. Inst. of Food and Environmental Hygiene)
599 hunted foxes were investigated from 2001 to 2003 to determine vaccination efficiency. Rabies oral vaccination contains bio-maker tetracycline. If a fox is getting vaccine bait, tetracycline cumulates in animal bones. Mandibula is used for detection of tetracycline using imunofluorescence test. 150 from 280 samples were positive to tetracycline in 2001, and 175 samples from 319 were positive in 2002. During research were studied influence of different factors to the vaccination efficiency and tendencies of rabies distribution during last 5 years (1998-2002). The results of the research indicate that rabies oral vaccination efficiency in foxes was 53.6% in 2001 and 54.8% in 2002. To reach good results in process of eradication of disease, oral rabies vaccination efficiency should be at least 65-80%. Taking into account our findings of the research, we came to conclusion that existing programme of rabies oral vaccination in Latvia has not give satisfactory results. The reason of that is insufficient number of disseminated oral vaccine baits. Moreover, the number of wild animals - foxes and raccoons are considerably increased during several last years. It is necessary to work out targeted rabies eradication programme, which should be oriented to radical decreasing of the number of foxes and raccoons and to carry out sufficient distribution of rabies oral vaccine baits. To obtain acceptable results programme must be performed at least 5 - 6 years.
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