Causes of croup include:
Viral infections, including:
- Influenza virus type A
- Respiratory syncytial virus
- Enteric cytopathogenic human orphan virus
- Measles virus
Tests for specific viruses are rarely performed, so the actual cause of croup is usually not known.
Conditions that resemble croup can also be caused by:
- Bacterial infections
- Softening of cartilage in the larynx (windpipe)
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