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KMID : 1094020120290010063
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Journal of Veterinary Clinics
2012 Volume.29 No. 1 p.63 ~ p.67
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A Sampling Strategy for Estimating Infection Rate in Vector Mosquitos of Mosquito-borne Bovine Viral Diseases
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Pak Son-Il
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Abstract
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Mosquitoes are the vectors of a number of viral diseases in cattle, such as Akabane disease, bovine ephemeral fever, Ainovirus infection, Chuzan virus infection, and Ibaraki disease. These diseases are transmitted from an infected animal to a non-infected host via the blood feeding of the vector. In Korea, the National Veterinary Research and Quarantine Services, Ministry for Food, Agriculture, Forestry and Fisheries is responsible for planning, implementation, laboratory investigations and reporting the results of the national surveillance program for mosquito-borne bovine diseases (MBD). The surveillance program, which was started in 1993, focused to determine the seroprevalence of each disease in cattle herds in space and time. From the epidemiological point of view, more important component of the surveillance program is to monitor infection rates in vectors for specific pathogens because this information is essential for a more precise understanding the dynamics of these diseases in a given environment and for determining risk of transmission. The aim of this study was to describe and compare methods for estimation of vector infection rates using maximum likelihood (MLE) and minimum infection rate in pooled samples. Factors affecting MLE such as number of pools, pooling size and diagnostic test performance are also discussed. assuming some hypothetical sampling scenarios for MBD.
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KEYWORD
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sampling strategy, vector infection rate, mosquito-borne disease, cattle
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