the continuous spread of west nile virus (wnv): seroprevalence in asymptomatic horses.west nile virus (wnv) was probably introduced in southern and northern mexico from the usa in two independent events. since then, wnv activity has been reported in several mexican states bordering the usa and the gulf of mexico, but disease manifestations seen there in humans and equids are quite different to those observed in the usa. we have analysed wnv seroprevalence in asymptomatic, unvaccinated equids from two mexican states where no data had been previously recorded. wnv igg antibodies we ...200919288961
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