There have been 800 confirmed cases of measles across 25 states so far this year, according to the latest update from the CDC ...

A measles outbreak has been declared in Pennsylvania. Earlier this week, the Erie County Health Department confirmed two additional cases of measles.

The virus has been found in 24 states overall, including Alaska, Arkansas, California, Colorado, Florida, Georgia, Hawaii, ...

Dr. Helen Jiang tells PEOPLE why her practice is offering the MMR vaccine early — and why she's going to vaccinate her infant ...