West Nile Virus Detected in Crows in Zagreb

The Croatian Veterinary Institute has confirmed the presence of the West Nile virus in deceased crows within the City of Zagreb. The Ministry of Agriculture, Forestry and Fisheries announced the findings, which mark a significant public health concern.

The first confirmed case was identified on August 27, 2026, when a dead crow found in the Zapruđe area tested positive for the virus. The following day, laboratory tests confirmed the virus in four additional crows discovered in various locations across the city, including Kvaternikov trg, Park Bartola Kašića, Savica, and Dubrava (Dubec).

According to the Ministry, the West Nile virus is exclusively transmitted through the bite of infected mosquitoes, primarily those from the Culex genus, which are common throughout Croatia. While mosquitoes most frequently spread the virus among birds, they can also transmit it to humans and horses. However, humans and horses are considered accidental hosts and cannot serve as a source of infection for others.

Citizens who observe two or more dead wild birds in the same location are urged to report this to their nearest authorized veterinary organization. This measure will help in promptly identifying and potentially containing any outbreaks of infectious animal diseases.

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The West Nile virus is transmitted exclusively by the bite of infected mosquitoes. The most significant vectors are mosquitoes from the Culex genus, which are present throughout Croatia. Mosquitoes most often transmit the virus between birds, and can sporadically transmit it to humans and horses. Humans and horses are accidental and terminal hosts and cannot be a source of infection for others. The virus is not transmitted from person or horse to another person or animal.