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,

Additional measles cases "are likely to occur" as an outbreak of the virus grows, the Texas Department of State Health Services said in its latest update.

The ongoing measles outbreak in West Texas has doubled in size to 48 cases. It's the state's worst in nearly 30 years.