Health officials sound alarms after Texas measles outbreak spreads to metropolitan area with nearly 100 sick now - Measles cases have also spread to neighboring New Mexico, sickening primarily childre

The largest measles outbreak in decades has reached San Antonio and San Marcos. 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.

Confirmed measles cases in Texas have reached at least 90, making this the worst measles outbreak in 30 years. Experts warn the number of Texas cases is likely much higher.