Two Texas universities and their surrounding communities have issued warnings about potential exposure to measles after giving campus tours to at least one person who tested positive for the virus. Experts have been tracking the measles outbreak in Gaines County since late January.

A warning has been issued for three Texas cities after someone with measles visited them while contagious. The Texas Department of State Health Services (DHSH) shared the warning on Monday "so unvaccinated people may monitor themselves for symptoms and seek testing if symptoms occur.

Officials say an individual who tested positive for the virus in West Texas traveled to two major universities and one of the nation's busiest tourist attractions — the San Antonio River Walk.

Lea County, New Mexico, is now reporting an outbreak of measles, according to the New Mexico Department of Health (NMD