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In otherwise healthy adults
Bacterial pneumonia. Symptoms of pneumonia caused by bacteria in otherwise healthy people younger than 65 usually come on suddenly. They often start during or after an upper respiratory infection, such as the flu or a cold. Symptoms may include:
Nonbacterial pneumonia. Symptoms of pneumonia not caused by bacteria may come on gradually and are often not as bad or as obvious as symptoms of bacterial pneumonia. Many people don't know that they have nonbacterial pneumonia, because they don't feel sick. But symptoms may include:
When symptoms are mild, your doctor may call your condition "walking pneumonia."
In older adults and children
Older adults may have different, fewer, or milder symptoms, such as having no fever or having a cough with no mucus (a dry or nonproductive cough). The major sign of pneumonia in older adults may be a change in how clearly they think (confusion or delirium) or when a lung disease they already have gets worse.
In children, symptoms may depend on age:
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