On a humid January morning in 2023, deep in the heart of Côte d’Ivoire’s Taï National Park, a baby monkey fell ill. Its skin ...

Smallpox, one of the biggest killers in history, is caused by a virus called variola. Variola causes a distinctive rash and is often lethal. The name variola comes from the Latin word for “spotted” ...

Chickenpox is caused by the varicella-zoster virus, which is transmitted through direct contact with an infected person, or indirectly through airborne droplets. The virus stays dormant in the body ...