"Very high" levels of the virus were detected by the CDC in New Mexico, with "high" levels in Oregon, Arkansas, and Maine.

Illegal cattle ranching in Central America has led to the spread of a deadly parasite long thought to be eradicated, and ...

The bird flu outbreak killed over 17,000 elephant seals, including almost 97% of the pups, and left a scar on this vulnerable population.

A virulent new strain of antibiotic-resistant bacteria that causes severe disease could be spreading widely across Asia -- posing significant challenges to global public health.