If you've already been vaccinated for measles, do you need to get a booster now that it's spreading in the US?

Texas doctors said there's no harm in getting another measles vaccine if you don't know whether you were vaccinated as a child.

Amid one of the largest measles outbreaks in the United States in nearly a decade, anti-vaccine activists are promoting false claims that shots are ineffective in stemming the spread of the virus or that they could cause the disease.