Viral infections like the common cold or stomach virus infections are not usually treated with medications. Treatment for these infections is supportive care (rest, fluids, and time). Common viral infections cannot be completely prevented. As a result, the average preschool age child gets 8–10 colds a year. Infants and toddlers may get more. Some bacterial infections, like some ear and skin infections, are treated with antibiotics. Some infections can be prevented with vaccines.