The United States has registered its first death from measles since 2015, after a child who wasn’t vaccinated died in an outbreak in rural West Texas. Normally, most US cases are brought into the country by people who have travelled overseas.

The U.S. registered its first death from measles since 2015 this week, as a child who wasn’t vaccinated died in a measles outbreak in rural West Texas.

At least 124 cases have been reported since late January, mostly among children and teenagers who were unvaccinated or whose vaccination status was unknown.

A Texas measles outbreak has doubled in the last week to 124 cases, state health officials said Tuesday, a day after they warned a person infected with the highly contagious disease had traveled from the outbreak zone.

In Texas, officials are reporting that one unvaccinated child has died of measles. Officials say at least 124 people have been infected and 18 people hospitalized. Almost all have been babies and children who are unvaccinated or awaiting their second dose.

A child who tested positive for measles died in West Texas, the state health department said, marking the first death in an outbreak that has sickened nearly 140 people. The Texas Department of State Health Services said a school-age child died after being hospitalized in Lubbock.