hemorrhagic fever

Rift Valley fever spreads by mosquitoes and contact with infected livestock, causing abortion storms in animals and rare severe disease in humans.

Crimean-Congo hemorrhagic fever is a tick-borne virus with a 10 to 40 percent reported fatality. How it spreads, how it progresses, and what treats it.

Lassa fever virus explained: how rodents spread it, why most cases are mild, what causes deafness, and why ribavirin's benefit is still unproven.

Hantavirus explained: how rodent-borne viruses cause lung and kidney failure, what the 1993 Four Corners outbreak revealed, and how to cut your risk.

How yellow fever virus moves from monkeys to cities, why it attacks the liver, and how the 17D vaccine, a single dose, gives lifelong protection.

Ebola virus explained: how orthoebolaviruses infect cells, why fatality averages 50%, how outbreaks spread, and what vaccines and antibodies cover.