Quick Answer
YES. Most types of pneumonia (bacterial, viral, and "walking" pneumonia) are contagious. They spread through respiratory droplets when an infected person coughs or sneezes. However, some types (like fungal or aspiration pneumonia) are not contagious.
Transmission by Type
Bacterial Pneumonia
Contagious? Yes.
Duration: Until 24-48 hours after starting antibiotics and fever-free.
Viral Pneumonia
Contagious? Yes.
Duration: As long as you have symptoms usually, but can vary by virus.
Symptoms vs. Cold/Flu
| Symptom | Pneumonia | Cold/Flu |
|---|---|---|
| Fever | High, often with shaking chills | Moderate to High |
| Cough | Deep, productive (green/yellow/bloody mucus) | Dry or mild mucus |
| Chest Pain | Sharp, stabbing pain when breathing deeply | Mild discomfort |
| Breathing | Shortness of breath even at rest | Congested but usually okay |
What is "Walking Pneumonia"?
This is a milder form of pneumonia (usually bacterial). You might not feel sick enough to stay in bed, hence "walking." It is very contagious, especially in crowded places like schools or dorms.
When to Go to the ER
- • Difficulty breathing or rapid breathing
- • Chest pain that worsens when you breathe or cough
- • Bluish color to lips or fingernails (low oxygen)
- • Confusion/disorientation (especially in older adults)
- • High fever (102°F+) that doesn't improve
Medical Review
Reviewed by: Ricardo Hamilton, MD
Last Updated: December 15, 2025
Sources: CDC, American Lung Association, NHS