Infectious Diseases

Why an Infection Can Seem Better, Then Worse Again

An infection that improves and then worsens can have several causes. Learn what may explain the pattern, when to call a clinician, and which signs need emergency care.

After an Infection: How to Tell Recovery from a Complication or New Illness

Learn how symptom trends can point toward recovery, a complication, or a new illness—and which warning signs call for prompt or emergency care.