A child in West Texas has died of measles, state health officials said on Wednesday, the first reported U.S. death from the highly contagious disease in a decade, as a Texas outbreak has grown from a handful of cases to more than 130 across two states.

Texas faces its worst measles outbreak in over 30 years, with the first US measles death since 2015, prompting calls for action from Democratic leaders.

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.