Challenge trials help researchers study immune responses. Skeptics still doubt the approach is worth the risks ...

Antibiotic treatment during an influenza infection actually impaired the body’s efforts to clear bacteria rather than helping the body heal.

Medically reviewed by Susan Bard, MD Having psoriasis, an autoimmune condition that causes inflamed skin patches, can make ...

Public health officials are concerned that we could move back into a situation like that of the early 20th century, before ...