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Western equine encephalitis in Argentina

On 20 December, the International Health Regulations National Focal Point (IHR NFP) of Argentina notified the World Health Organization (WHO) of a human case of Western Equine Encephalitis (WEE) infection.

This is the first confirmed human case reported after more than two decades, since the last reported human cases in Argentina occurred in 1982/1983 and 1996.’

WEE is a rare mosquito-borne viral disease that affects equines and humans. Most human cases are associated with epidemics in birds or horses. The virus has the potential to spread to other areas through the migration of infected birds or the movement of people and animals carrying the virus. Given that birds act as a reservoir, they can act as amplifying hosts for viral dissemination to other countries.

At-risk groups include people who live, work, or participate in outdoor activities in endemic areas or where there are declared active disease outbreaks in animals.

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