On Oct. 23, 2026, The US Centers for Disease Control and Prevention (CDC) reported 4,588 measles cases in ‌the country as of October 22, up 178 from a week earlier, as an ​outbreak of the highly contagious ​disease continues.

Here are some key details:

Measles-related hospitalizations ⁠this year stand at 479, ​according to CDC

The Pennsylvania state health department ​has reported five measles-related deaths so far in 2026, but the CDC has confirmed only three ​measles-associated deaths

Pennsylvania reported 1,338 measles cases ​so far as of October 23, with 255 ‌hospitalizations, ⁠according to state health department data

Children and teenagers aged 5 to 19 constituted the largest group of people affected ​by the ​disease ⁠at 1,914, or 42% of all reported cases, followed by ​adults aged 20 and older ​at ⁠1,881 cases or 41%, CDC data showed

The CDC previously said it would deploy additional ⁠support ​to Pennsylvania to help ​investigate the outbreak