These are the first known cases of individuals catching the virus from their pets in Canada or the U.S.

Lab experiments and metagenomic analyses of flies’ resident bacteria indicate that the insects carry microbes from place to place on their legs.

Medical organizations endorse the “Undetectable = Untransmissible” campaign, which aims to raise awareness of scientific evidence showing that virally suppressed people living with HIV cannot infect others.

A government investigation into the cause of a Utah man’s infection comes up short of conclusive results.

More local transmission within the U.S.; babies born with costly birth defects; virus persists in a patient’s semen for six months

Placental macrophages called Hofbauer cells are particularly vulnerable to infection by the virus, a study shows.

The viral strain scientists isolated from two nonhuman primates is identical to the one circulating among humans.

The Japanese encephalitis virus, which typically moves to new hosts via mosquito vectors, can jump directly between pigs, according to a study.

Researchers detect Ebola virus fragments in semen samples from some male survivors up to nine months after the onset of symptoms.

Much of the CD4+ T-cell death that occurs during HIV infection may be caused by direct delivery of the virus from neighboring cells, a study shows.