Measles is serious for people of all ages, but some groups are more likely to have complications with the virus: - Children younger than 5 - Pregnant women - People with weakened immune system Symptoms of measles will start around 7-14 days after being exposed. If you have symptoms of measles, CALL your healthcare provider immediately. Visit hhs.iowa.gov/disease-information for information on measles and how to protect yourself and your family.