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.

Since the outbreak of measles emerged last month, the Texas Health Department has confirmed 90 new cases with at least 16 hospitalizations. According to officials, most of those infected are under the age of 18 years and unvaccinated.

There is a measles outbreak in the South Plains region of Texas, with 58 confirmed cases, primarily in Gaines County, which accounts for 45 cases.