At least 49 cases have been confirmed. Health officials — who are scrambling to get a handle on the vaccine-preventable outbreak — suspect 200 to 300 people may be infected.

The ongoing measles outbreak in West Texas has doubled in size to 48 cases. It's the state's worst in nearly 30 years.

The measles outbreak, which began spreading in late January, has caused several hospitalizations, with at least nine confirmed cases and three probable cases as early February. Health officials warn that at least one in five afflicted individuals will need to be hospitalized,