The CDC’s warning was provided in a Health Alert Network (HAN) Health Advisory released late last week. As of Tuesday, Texas health officials have documented 223 measles cases in the state, with 29 hospitalized and one dead as a result. Measles has also been reported in other states this year, including New Mexico, New York, Alaska, and Florida.

A measles outbreak in the southwestern US has killed two people and infected more than 200, prompting a top health agency to issue a travel warning.