Where Does Bronchiolitis Come from?

Bronchiolitis is caused by a virus known as the respiratory syncytial virus (RSV), which is spread through tiny droplets of liquid from the coughs or sneezes of someone who's infected. The infection causes the smallest airways in the lungs (the bronchioles) to become infected and inflamed.

How does a baby catch bronchiolitis?

The viruses that cause bronchiolitis are easily spread. You can contract them through droplets in the air when someone who is sick coughs, sneezes or talks. You can also get them by touching shared objects — such as utensils, towels or toys — and then touching your eyes, nose or mouth.

What is the main cause of bronchiolitis?

Bronchiolitis is almost always caused by a viral infection. In most cases, the respiratory syncytial virus (RSV) is responsible.