Symptoms and Illnesses
Human parainfluenza viruses (HPIVs) commonly cause upper and lower respiratory illnesses. After you get infected, it takes about 2 to 7 days before you develop symptoms.
Symptoms of upper respiratory illness may include—
- runny nose, and
HPIVs can cause severe lower respiratory illness, such as—
- croup or laryngotracheobronchitis (swelling around the vocal chords and windpipe),
- bronchitis (swelling of the main air passages that connect the windpipe to the lungs),
- bronchiolitis (swelling in the smallest air passages in the lungs), and
Young children are more likely to have severe illness, but older adults and people with weakened immune systems are also at risk.
Other symptoms of HPIV illness may include—
- ear infection,
- irritability, and
- decreased appetite.
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