Yellow fever is a dangerous mosquito-borne virus that, for hundreds of years, has caused sporadic, deadly outbreaks in the tropics of South America, Central America, and Africa. According to a new ...

Symptoms include a high temperature, headache and sickness.

An ongoing outbreak of yellow fever in Colombia is sickening and killing rare and threatened monkey species in captivity, a new study shows. Between February and May 2025, authorities reported eight ...

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