This year’s flu season is shaping up to be a nasty one—driven by a new variant of the influenza virus that may be able to slip past our vaccine defenses. A mutated form of the influenza A strain H3N2 ...

Data shows that measles cases have reached the highest level in the past 33 years. The two-dose MMR vaccine is 97 percent effective at preventing measles infection. New measles cases have been ...