A measles case has been confirmed in an unvaccinated adult who recently traveled internationally, according to Colorado health officials, the first measles case in the state in years as an outbreak of the highly contagious illness continues spreading in Texas and several other states.

An unvaccinated adult who lives in Pueblo developed measles after visiting a part of Mexico that has an ongoing outbreak.

A Pueblo resident was exposed to a measles outbreak in Mexico during travel and tested positive for the disease. Here's everything you need to know.