Infections tend to be most common among older children and adolescents but in 2024 have been rampant among young children, the CDC says.

Bronchitis can lead to pneumonia, which is a deeper and far more serious infection of the lungs' air sacs. Pneumonia can develop in part of one lung or an entire lung or both lungs.

ROME (AP) — Pope Francis has developed pneumonia in both lungs, the Vatican said Tuesday, after new tests showed a further complication in the condition of the 88-year-old pontiff that raised concerns ...