Texas health officials said Tuesday the state now has 58 confirmed measles cases. What is measles, how do you contract it and how deadly is it?

At least 58 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.

State health officials are seeking to confirm the vaccine status of the four self-reported cases, but no mutations of the virus have been recorded.