Measles exposure alerts rise

A person with measles passed through Boise Airport on March 29, and Idaho is warning anyone who was there between 1:30 a.m. and 7:40 a.m. that the virus can still infect people up to two hours after the sick person leaves the area. (healthandwelfare.idaho.gov) Arizona put out a second alert on April 9 after Maricopa County confirmed a measles case in a Queen Creek resident with no known source of exposure, which means investigators cannot tie it to an earlier county case. The county listed public exposure sites including a Costco on April 3, a Walmart on April 4, and Generation Church in Queen Creek on April 5. (maricopa.gov) Measles spreads through the air the way cigarette smoke hangs in a room after someone walks out. The Centers for Disease Control and Prevention says symptoms usually start 7 to 14 days after exposure, beginning with high fever, cough, runny nose, and red watery eyes before the rash shows up. (cdc.gov) The reason airport terminals, big-box stores, and church gatherings keep showing up in these alerts is simple: measles is one of the easiest viruses on earth to catch. Idaho says an unprotected person can get infected even after entering the same space up to two hours later. (healthandwelfare.idaho.gov) Babies are getting caught in the middle because the routine measles, mumps, and rubella shot is usually given at 12 to 15 months, leaving infants under 12 months without that standard protection. Idaho says infants 6 to 11 months can get an early dose before international travel or travel to a large outbreak area in the United States if a doctor recommends it. (healthandwelfare.idaho.gov) This is not a handful of isolated scares. The American Academy of Pediatrics reported 1,671 confirmed measles cases in the United States as of April 2, 2026, with 94% tied to outbreaks, after 2,286 confirmed cases in 2025. (publications.aap.org) The United States has technically kept its measles elimination status since 2000, but that label has a narrow meaning: no continuous transmission inside the country for 12 months or more. Johns Hopkins says 2026 is already on track to surpass 2025’s record-breaking total, so health officials are now checking whether transmission has crossed that line. (publichealth.jhu.edu) The Pan American Health Organization moved the review of U.S. measles elimination status from mid-April to November 2026 while health authorities finish genome sequencing, which is the virus equivalent of reading barcodes to see whether cases belong to the same chain of spread. The one-year analysis window for the United States runs from January 20, 2025. (paho.org) Behind the surge is a slow drop in vaccination coverage. Johns Hopkins says the share of U.S. kindergarten students getting all vaccines, especially measles, mumps, and rubella vaccine, has slipped from around 95% to just over 92%, leaving more pockets where the virus can move from child to child. (publichealth.jhu.edu) Measles is not just a rash that keeps kids home for a week. The Centers for Disease Control and Prevention says about 1 in 5 unvaccinated people in the United States who get measles is hospitalized, and pneumonia remains the most common cause of death in young children with measles. (cdc.gov)