10 Tonsillitis Causes
Reviewed: Dr. Gromatzky
8. Parainfluenza Viruses
Despite similarities in the name, the parainfluenza virus is not related to the influenza virus. There are four types of parainfluenza virus, each of which can cause different disease and symptoms. They all cause respiratory infections, and the symptoms can range from being mild, to being severe.
Parainfluenza viruses can cause croup, which causes a cough, hoarse voice, fever, and other symptoms similar to a cold. It is also sometimes responsible for cases of pneumonia, and it can also sometimes cause bronchitis. Most people with a parainfluenza virus will make a full recovery, but those with a weakened immune system are at risk.
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