MEASLES: 5 Infants Infected in Chicago

This is perhaps the worst part of the measles outbreak -- five infants in Chicago have tested positive for the disease.

The children are all younger than 12 months, which is when they would get their first dose of the vaccine. They all attend a KinderCare day-care center. Workers and students are now being told to stay home for the next 21 days if they aren't vaccinated.

Chicago had another case of measles a month ago, but in the previous five years, only 10 had been reported in the city.