At least 124 cases of measles have been reported in Texas since late January — marking the largest outbreak in the state in close to 30 years. The dozens of reported cases have mostly affected children,

Texas' measles outbreak is up to 90 cases. Here's what you need to know about the virus, vaccination and boosters.

The surge in measles cases in Texas began in late January when two cases were reported in Gaines County, as reported by The Houston Chronicle. Since then, the number of cases in Gaines County reached 80,