RSV is the most common cause of bronchiolitis - inflammation of the lower airways - and pneumonia in babies.

Also called atopic dermatitis, eczema causes the skin to itch, turn red, and flake. It usually appears in babies or very young children, and can last until adolescence or adulthood.

Strep throat is an infection of the throat caused by a bacteria that can spread via airborne droplets or saliva such as when sharing food or drinks.