It’s the first time the deadly pathogen has been found in West Africa.

Some patients could suppress the virus without antiretroviral therapy for months after the drug infusions.

Lab mice suffering from inexplicable renal failure turn out to be infected with a hitherto unknown virus.

Scientists have found a previously unknown virus in Myanmar.

A Florida teenager is the first person with a confirmed infection by the mosquito-borne virus.

The results suggest the virus could severely alter brain development in infants infected after birth, but blocking a signaling protein early on might ease certain symptoms.

Fruit bats are a reservoir for the disease, which can cause brain damage.

Researchers found a previously undiscovered hepadnavirus in an immunocompromised cat.

The drugs’ disruption of the microbiome makes a subsequent flavivirus infection more severe.