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.

Texas is now reporting 223 measles cases in the outbreak that began in Gaines County. There are dozens more cases in New Mexico, too.

As the outbreak rages, unproven remedies like cod liver oil are being distributed free by some doctors. Families are lining up for them.