According to the society, the last US measles death was in 2015. A measles infection can have particularly devastating complications for pregnant women and young children, including pneumonia, neurological impairment, hearing loss and death.

CDC staff received an email this week telling them to avoid using more than a dozen terms or words-- including "health equity," "race," "bias," and "disparity" -- in their annual performance evaluations;

A Texas measles outbreak has doubled in the last week to 124 cases, state health officials said Tuesday, a day after they warned a person infected with the highly contagious disease had traveled from the outbreak zone.