After a pediatric patient in West Texas died of measles complications, hospital officials are urging the community to take the outbreak seriously, and to educate themselves about the virus and vaccination.

NBC 5 is taking a closer look at measles vaccinations in North Texas, including which county has seen the biggest decline and which DFW residents may need a booster. State data shows that thousands fewer students are receiving the measles vaccine in North Texas compared to just a few years ago.

Here’s what to know about the outbreak after the first U.S. death since 2015 from the highly contagious—but preventable—respiratory disease.