“Infected people are contagious from 4 days before the rash starts through 4 days afterward. The incubation period for measles, from exposure to fever, is usually about 7-10 days, and from exposure to rash onset is usually about 10-14 days (with a range of 7 to 21 days),” the CDC says.

With a major outbreak in Texas and New Mexico, Maine CDC Director Dr. Puthiery Va answers questions about vaccinations, the risks of the disease, and reports of alternative prevention methods and treatments.