An outbreak of measles in the US is approaching 100 cases as it spreads into more heavily populated areas, predominantly affecting children and adolescents. First detected in late January as two schoolchildren were hospitalized for the disease in Gaines County,

Texas' measles outbreak is now at 90 cases, the highest yearly case count since 1992. Experts say the number is likely to grow more. Here's why.

A fast-growing measles outbreak in West Texas has nearly doubled in just one week, now totaling 90 cases across seven counties and spreading to New Mexico. Earlier this week, the Texas Department of State Health Services confirmed 49 cases in five counties.