The measles outbreak in West Texas has grown to 58 cases as of Tuesday. Eight people in neighboring eastern New Mexico also have been diagnosed with the highly contagious disease.

An ongoing measles outbreak that began in one of Texas' least vaccinated counties has mushroomed to 90 cases across a cluster of seven counties in the state, according to an update by the Texas Department of State Health Services on Friday.

Two separate outbreaks of measles in the U.S. Southwest have now accounted for nearly 100 confirmed cases and hospitalized 16 people.