has confirmed at least nine cases of measles over the past month after a person contracted the highly contagious virus outside the United States and exposed a parent and child at a children’s hospital. CHOP has shared  information on how to protect your family. The most important thing you can do is make sure all children and adults in your household are up to date on their recommended vaccinations — all of them. Because measles is highly contagious, it’s also important for parents to take precautions with children who are either too young to be vaccinated or who cannot get the vaccine for medical reasons.