Human parainfluenza viruses cause respiratory infections. They are most common in children. There are four different types of human parainfluenza viruses: HPIV-1, HPIV-2, HPIV-3, and HPIV-4.
These sneaky little viruses can bring on a range of illnesses, from a pesky common cold to more serious respiratory infections. It's crucial to understand the different types of respiratory ...