As global temperatures rise, mosquitoes are spreading faster and farther, fueling a dangerous increase in yellow fever and dengue cases that threatens public health worldwide.

Experts are warning that yellow fever — which hasn’t had a major outbreak in the U.S. since 1905 — could make a comeback. (Photo illustration: Yahoo News; photo: Getty Image) When you think of yellow ...

The virus that causes yellow fever has a permanent foothold in the Brazilian Amazon, where the pathogen is widespread in wild animals living in the region’s forest. Now scientists have discovered that ...

Malaria and leprosy cases in Florida have people more aware of diseases that have flown under the public’s radar for years. Dengue fever, a mosquito-borne illness related to the viruses that cause ...