(HealthDay News) -- Pneumonia is a lung infection that most often spreads through coughing, sneezing or touching.
Most people recover in one to three weeks, but pneumonia can be deadly, especially among people with weaker immune systems.
The American Lung Association explains how pneumonia may be diagnosed:
Moderna Starts Large Bird Flu Study Despite Earlier HHS Funding Loss
52 Kids Have Died From Flu So Far This Season as Child Hospitalizations Rise
Tamiflu Safe For Children, Study Concludes
New Flu Strain Weakened This Year’s Vaccine Protection, CDC Says
Breakdown In Federal Health Tracking Leaves U.S. Vulnerable To Outbreaks, Pandemics, Experts Warn