Colorado on Friday reported its fifth incidence of measles this year, and, for the first time in the spate of cases, the infection was in a person who had been vaccinated against the disease.
The person, an adult living in Denver, had recently traveled to the Mexican state of Chihuahua, which is seeing an outbreak of measles. Two other cases identified in Colorado — one in a baby in Denver and another in a Pueblo resident — were also connected to travel to Chihuahua.
The Colorado Department of Public Health and Environment identified one location where people may have been exposed to the virus as a result of this case…