Dioxathion - Identification, toxicity, use, water pollution potential, ecological toxicity and regulatory information. Note: See Working with the Information on this Page section below for important notes about this data.
Symptoms of rotavirus â the leading cause of viral gastroenteritis in infants and young children â usually appear one to three days after exposure. But you're contagious even before you develop symptoms, and up to two weeks after you've recovered.
First, scientists involved with common cold research do not know exactly how long a person with a cold is contagious. Based on previous studies, their best guess is that a person becomes contagious about two to three days before developing the usual symptoms of a cold. Second, this contagious period can last until the person no longer shows any symptoms. So in theory, a person is contagious for about two weeks.