Officials at Legacy Traditional School – Cibolo said Thursday they had confirmed a measles case in a first-grade classroom. They later said the case was actually rubella.

A child’s death this past week in Texas is the first U.S. death from measles, a highly contagious but preventable respiratory disease since 2015, according to the U.S. Centers for Disease

The warning against measles parties comes days after an unvaccinated child died of measles in Lubbock County about month after an outbreak began in West Texas.