A fourth death related to measles has been reported, marking a significant milestone in a growing outbreak. This is the highest number of measles deaths in the US in decades, with the last time being in 1992. The latest death occurred in an unvaccinated person, while previous deaths were in infants with measles and a 40-year-old woman.

Further details about the outbreak and the deaths are available from the source. The outbreak has also sparked ongoing political clashes.

The number of measles deaths this year exceeds the total from last year, when there were three deaths reported in the US.