Prevalency and control of the spread of artritis and encefalitis infection in goats

Abstract

Bolest AEK-a je neizlječiva virusna bolest koza. Dijagnosticira se serološkom pretragom (AGIDT, ELISA). Virus se najčešće prenosi vertikalno, s majke na potomstvo, kolostrumom i mlijekom ali se jednako brzo širi i horizontalno kohabitacijom. Inficirana grla permanentno izlučuju virus što pridonosi širenju virusa i visokoj prevalenciji. U Hrvatskoj je utvrđeno više od 50% inficiranih grla, a njih čak 30% pokazuje simptome kliničkog mastitisa. U drugim zemljama stopa prevalencije se kreće od svega nekoliko postotaka (Turska, Italija) do 10% ili više (Brazil). Provedba kvalitetnog programa iskorjenjivanja moţe rezultirati smanjenjem prevalencije na 1% i manje kao što je primjer Italije (prevalencija ţivotinja smanjena sa 14% na 1% i prevalencija stada sa 32% na 6% ). Model iskorjenjivanja bolesti se temelji na izlučenju serološki pozitivnih jedinki pri čemu problem može predstavljati postojanje inficiranih jedinki bez prisutnosti protutijela što je utvrđeno u Meksiku.CAEV is an incurable viral goat’s disease, diagnosed by serological tests (AGIDT, ELISA). The virus can be transmitted vertically, from mother to kid, via colostrum and milk, but also efectivelly spreads horizontally. Infected goats permanentlysecrete the virus which contributes to the spreading of disease and to the prevalence growth. Over than 50% infected goats have been found in Croatia, and 30% of them show symptoms of clinical mastitis. In other countries the prevalence ranged from a few percent (Turkey, Italy) to 10% or more (Brazil). The implementation of a high-quality eradication program can result in a reduction to less than 1% of prevalence as was exemined in Italy (CAEV prevalence decreased from 14% to 1% calculated on animal sample, and flock’s prevalence decresed from 32% to 6%). Eradication program should be based on the exclusion of the seropositive goats, but the problem may be the occurence of infected goats without serollogical confirmation of antibodies as was found in Mexico