Cases Reach

• Al 30 aprile 2026, gli Stati Uniti hanno riportato 1.814 casi confermati di morbillo, inclusi 12 tra i visitatori internazionali, secondo i dati CDC aggiornati al 1° maggio. • Il 93% dei casi (1.688) è associato a focolai, con 25 nuovi focolai nel 2026 che seguono i 24 precedenti. • Questo aumento sottolinea le persistenti lacune vaccinali, contribuendo alle sfide di salute pubblica dopo i 2.288 casi registrati nel 2025.

• The US measles case count increased by 43 cases last week to 1,714 total, according to the CDC's weekly update released April 10, 2026. • More than half of the new cases occurred in Utah, marking a smaller jump compared to the prior week's 96-case increase. • This ongoing outbreak highlights gaps in vaccination coverage amid public health concerns over declining immunization rates.

• The CDC reported 43 new measles cases in the US for the week ending April 10, 2026, bringing the national total to 1,714 cases. • More than half of the new cases occurred in Utah, which saw 73 infections last week alone after 142 cases in the past three weeks versus 197 for all of 2025. • The slower increase compared to the prior week's 96 cases highlights ongoing outbreaks concentrated in specific states amid declining vaccination rates.

• US measles cases climbed to 1,671 as of April 6, 2026, with 96 new infections reported in the past week, the vast majority in Utah according to the CDC weekly update. • All but 10 cases are linked to 32 states and New York City, with 94% associated with 17 outbreaks including one new outbreak of three or more related cases. • The number of affected states increased by one this week, highlighting ongoing transmission risks amid declining vaccination rates.

• A measles outbreak in Washtenaw County, southeast Michigan, now includes 7 cases under investigation involving unvaccinated children and adults, with potential exposure at Trinity Health Ann Arbor Hospital's ER on March 21. • The latest case concerns a young child treated in Ypsilanti, raising concerns that ER visitors may have been exposed to the highly contagious virus. • All confirmed and suspected cases are among unvaccinated individuals, highlighting ongoing vaccination gaps amid the outbreak's growth reported on March 25.

• As of March 6, 2026, the United States has confirmed 1,300 measles infections this year across 30 states, putting the country on track to surpass 2025's record 35-year high numbers. • Measles has continuously circulated in the U.S. for over a year following an outbreak in Texas (January-August 2025), with ongoing outbreaks on the Utah-Arizona border and in South Carolina that drastically increased in January 2026. • The Pan American Health Organization postponed its decision from April to November 2026 on whether the U.S. should lose its measles elimination status achieved in 2000, but current trends suggest it likely will due to vaccination rates falling below the critical 95% threshold.

The Centers for Disease Control and Prevention reported 1,362 confirmed measles cases nationwide in 2026, with 94% linked to ongoing outbreaks. South Carolina's outbreak, which began in October 2025, has decelerated to approximately 10 cases per week after peaking at 200 weekly cases in mid-January, bringing the state total to 996 cases as of March 13. Utah's outbreak, originating in June 2025, has accelerated to 405 cases as of March 10, representing a 47-case increase in one week. Both states currently host the largest active measles outbreaks in the United States.

The measles outbreak in Colorado tied to two Broomfield schools has grown to 10 cases, including two new confirmed infections and one suspected as of March 12. Public health teams are tracing exposures and urging quarantines. This cluster underscores vulnerabilities in school vaccination coverage amid rising national measles alerts. Officials plan expanded testing and contact tracing to halt further spread.

The measles outbreak linked to two schools in Broomfield, Colorado, has reached up to 10 cases, including two new confirmed infections and one suspected case reported on March 12. Public health officials are investigating exposures and urging vaccinations in the affected communities. This cluster highlights ongoing risks in under-vaccinated school groups amid national resurgence. Contact tracing and quarantine measures are ongoing to contain spread.