The measles outbreak in western Texas has now reached 624 cases, with 27 new infections confirmed over the last five days.

Nearly all of the cases are among unvaccinated individuals or among those whose vaccination status is unknown, according to new data published by the Texas Department of State Health Services (DSHS) on Tuesday.

Currently, 10 cases are among residents who have been vaccinated with one dose of the measles, mumps and rubella (MMR) vaccine, while 12 cases are among those vaccinated with two doses.

At least 64 measles patients have been hospitalized so far, according to the DSHS, with the majority of cases presenting in children and teenagers between ages 5 and 17, followed by children ages 4 and under.

Gaines County, which borders New Mexico, remains the epicenter of the outbreak, with 386 cases confirmed so far, DSHS data shows.

This is a developing story. Please check back for updates.