Colorado Measles Outbreak Tests School Immunity

A new measles outbreak in Colorado appears to have started at two Denver-area schools, with at least seven confirmed cases and several exposure sites, including the Denver International Airport; despite roughly 97% vaccination at the schools, the virus is spreading among unvaccinated students, prompting a 21-day exclusion period to curb transmission and illustrating how measles can seed wider outbreaks. The piece places Colorado’s situation in the context of a nationwide rise in cases and compares it with Utah’s larger outbreak, underscoring the ongoing public health challenge of tracing contacts and preventing community spread.