Add Yahoo as a preferred source to see more of our stories on Google. Experts are warning that yellow fever — which hasn’t had a major outbreak in the U.S. since 1905 — could make a comeback. (Photo ...

Encephalitis, Yellow Fever, Malaria Disease, Mayaro or Zika Virus Infected Culex Mosquito Parasite Insect Macro. [Courtesy/GettyImages] Kenya has recently experienced a worrying rise in mosquito-borne ...

University of Queensland researchers visualized yellow fever virus particles at near-atomic detail, uncovering major structural differences between vaccine and virulent strains. The insights could ...

A species of invasive, "aggressive" mosquitoes known for transmitting yellow fever is spreading in California, according to local health officials. Multiple counties across the state, including Contra ...