Measles is one of the most contagious viruses in the world, and can live on surfaces or suspended in the air for two hours. Public health recommendations call for children to receive their first shot to protect against it between 12 months and 15 months old, and a second round between the ages of 4 and 6.

A newborn with measles is among the cases reported in the growing West Texas outbreak, Lubbock public health officials say. Experts say the case serves as a reminder that the disease can be especially dangerous for pregnant women and very young children.

Counties in California, New York and Maryland detected their first measles cases of the year. The CDC has warned travelers to be vigilant as spring break begins.

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