Three hundred and twenty-one cases have been reported in the ongoing measles outbreak in Texas, New Mexico and Oklahoma, the states said Tuesday. This is an increase of 25 cases since an update on Friday.

The measles outbreak that began in West Texas has now grown to more than 300 cases across three states.

Measles cases related to the outbreak have been reported in 11 Texas counties since late January, with the vast majority of 191 in Gaines County, followed by Terry County with 36 cases and Dawson and Yoakum counties each with 11. There have been seven other cases in the state not tied to the West Texas outbreak.