The measles outbreak that began in West Texas is still growing, with exposures possible as far away as San Marcos and San Antonio.

A measles outbreak in northwest Texas grew to 124 cases in nine counties on Tuesday, and health officials warned that residents in other parts of the state may have been exposed to the highly contagious respiratory illness.

Four of the newly reported cases are located in Dallam County, 200 miles north of Gaines County where the outbreak originated.