The highest number of measles cases in 20 years has federal health officials concerned.
The decision to vaccinate a child is a personal one, but in New York City the health board recently passed a mandatory flu shot plan for some children under six.
A new study shows a growing number of parents with safety concerns are not letting their children get the vaccine that prevents cervical cancer. Experts call that worrying and puzzling.
Colorado is having its worst whooping cough season in at least six decades.