News & Perspective

The CDC estimates the nation's Lyme disease burden at about 300,000 cases per year, far more than are actually reported.

Researchers found clear evidence that an intense immune response played a role in the demise of some pandemic H1N1 victims.

West Nile virus activity is well below last summer's big spike, but cases have been reported in 42 states so far.

A new molecular strategy could diffuse some of the controversy over lab-modified flu viruses.