While a measles case has yet to be confirmed in San Antonio and Bexar County, hundreds of thousands of residents may have been exposed to the virus spreading rapidly throughout the state.

A growing number of Central Texas health departments are warning residents of possible exposure to measles, the latest sign that the outbreak in West Texas is spreading across the state. Why it matters: Measles is a highly contagious and potentially life-threatening disease that has surged in areas with high vaccination exemption rates.

With one death now reported in Gaines County and the 124 cases we know about so far, many are asking just how contagious the virus is.