Unvaccinated traveler linked to measles spread across flights, CDC finds

CDC researchers traced a May 2025 measles case in an unvaccinated traveler from Europe who flew to Denver and then North Dakota, exposing 135 domestic travelers and leading to 17 infections (15 secondary, including 10 with at least one vaccine dose and 5 unvaccinated; 5 hospitalizations). The findings reinforce vaccination before international travel and delaying travel when febrile or symptomatic. The digest also notes mpox spillover in Ivory Coast mangabeys from a rope squirrel, a novel H1N1 swine flu case in Catalonia with no onward transmission, and several health-policy quick takes.