What are the symptoms of HPIV virus?

Human parainfluenza viruses (HPIV) can cause respiratory infections, particularly in young children. Symptoms often include cough, fever, runny nose, and sore throat. In some cases, HPIV can lead to more severe conditions such as croup or bronchitis, characterized by wheezing and difficulty breathing. While most infections are mild, those with weakened immune systems may experience more severe illness.