Measles cases in Texas and New Mexico rose to 370 on Tuesday, the health departments of the states said, an increase of 19 infections since their previous reports four days ago, as the United States deals with one of the largest measles outbreaks in the past decade.

The measles outbreak that began in the South Plain regions of Texas has swelled to more than 370 cases in three states.

Measles cases in Texas and New Mexico rose to 370 today, the states’ health departments said, an increase of 19 infections since their previous reports four days ago, as the United States deals with one of the largest measles outbreaks in the past decade.