ebola

Marburg virus explained: bat reservoir, symptoms, outbreak history from 1967 to 2025, why fatality ranges from 24% to 88%, and the status of vaccines.

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

Some viruses kill almost everyone they infect. Others spread so fast they ignite global pandemics. Here are the most dangerous viruses on Earth and the science behind their lethality.