M easles outbreaks in West Texas and New Mexico are now up to nearly 300 cases, and two unvaccinated people have died from measles-related causes. Measles is caused by a highly contagious virus that's airborne and spreads easily when an infected person breathes, sneezes or coughs. It is preventable through vaccines, and has been considered eliminated from the U.S. since 2000. As of Friday, the U.S. Centers for Disease Control and Prevention said its count of confirmed measles cases in the U.S.