The observation that milkmaids are frequently infected with cowpox but rarely catch smallpox is generally credited to the English doctor Edward Jenner.

The World Health Organization (WHO) held a meeting on Monday to discuss the future of smallpox virus samples, which Russia and the US are seeking to preserve while other countries wish for them to be destroyed.

Viruses have led scientists at Washington University School of Medicine in St. Louis to the discovery of a security system in host cells.

HARRISBURG, Pa., Nov. 5, 2010 /PRNewswire-USNewswire/ -- Agriculture Secretary Russell C.

A new study of an exotic, infectious virus that has caused three recent outbreaks in the United States reveals clues to how the virus might damage lungs during infection.