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.

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

The unvaccinated school-age child is the first confirmed fatality in Texas’s worst measles outbreak in three decades.