An outbreak of measles in the South Plains of Texas is continuing to grow, with the number of cases doubling in less than a week.

At least 48 cases were identified with symptom onset within the last three weeks, according to the Texas Department of State Health Services. More than a dozen people were hospitalized.

Fox News Digital previously reported the Texas Department of State Health Services (DSHS) warned the outbreak mostly involves school-aged children in Gaines County.

Health officials are investigating a measles outbreak in Texas. (iStock )

Those who believe they may have measles, or may have been exposed to measles, should isolate and call their doctor before arriving to be tested, according to the DSHS. 

The best way to prevent getting sick is by receiving two doses of the measles-mumps-rubella vaccine, according to officials.

Fox News Digital’s Christina Shaw contributed to this report.