A measles outbreak that began in Texas at the start of the year has infected over 300 people as of Tuesday, as cases of the highly contagious illness have been spotted in 17 states and already exceeded the total number of measles cases reported in 2024.

As new cases are reported, our maps and illustrations show the spread of the virus and how infections can run through a community.

Measles is continuing to spread across the Texas Panhandle and South Plains regions breaking 300 cases on Friday.