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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—

  • fever,
  • runny nose, and
  • cough.

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
  • pneumonia.

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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