vaccinations

Millions of children were now susceptible to measles, among the world’s most contagious diseases, according to a new report.

Health officials authorized a plan to give people one-fifth the usual dose, citing research suggesting that the reduced amount is about as effective.

Lyme is a growing problem, with cases rising and warming weather helping ticks expand their habitat.

California lawmakers have amended a bill that would have let preteens be vaccinated without their parents’ consent.