A significant measles outbreak has reached a notable milestone, with reported cases exceeding 1,000. This outbreak is the largest to affect a state in over three decades.

The number of cases has crossed into four-digit territory, marking a severe escalation of the outbreak. Further information about the outbreak is available from the source.

The current year is shaping up to be the worst for measles in the US since 1991, with the outbreak in Pennsylvania being a major contributor to this trend.