The virus in the first severe human bird flu case in the U.S. was found to have mutated. Newsweek's live blog is closed.

The Ebola virus devastated west Africa in 2014, claiming over 11,000 lives in Sierra Leone, Liberia and Guinea.

The poop, or guano, of infected birds is teeming with viruses. Out of all known influenza subtypes, all but two have been found in birds. The other two subtypes have only been found in bats.

When human activities disrupt and unbalance ecosystems, such as by way of climate change and biodiversity loss, things go ...

Latent infection Bats are the only known species in which symptomless carriers exist ... either as multipliers or simply as physical carriers of the virus. Many of the viruses they carry are ...

Learn why humans may be at low risk, but cattle are highly susceptible to a recently emerged genotype that is not yet well ...