How a Measles Outbreak Begins, Featuring the State of Colorado
Briefly

How a Measles Outbreak Begins, Featuring the State of Colorado
"To date, there have been 1,281 confirmed measles infections in the country in 2026 through the first week of March, a pace that is running well ahead of the 2,283 confirmed measles cases that were recorded in the country last year, a mark that was already the highest in 34 years, unseen since the last major measles wave of the early 1990s."
"Most of these cases happen via 'outbreaks,' which is not just a colloquial term, but an epidemiological one, implying local spread of linked cases in three or more people. Outbreaks are how waves of a highly infectious disease like measles begin."
"Nearly every state in the U.S. reported at least a handful of measles cases in 2025, and Colorado was no exception, with 35 total cases. This may be linked to the fact that it borders three states that saw some of the highest figures for measles last year, in the form of Arizona, Utah and New Mexico."
The United States is experiencing a measles resurgence with 1,281 confirmed cases through early March 2026, already outpacing 2025's record 2,283 cases—the highest in 34 years. Measles spreads through outbreaks, defined as linked cases in three or more people, which initiate waves of this highly infectious disease. Colorado reported 35 cases in 2025 and remained case-free through February 2026, but a new outbreak emerged in March. This outbreak likely stems from neighboring states Arizona, Utah, and New Mexico, which experienced high case counts linked to a major Texas outbreak that caused child deaths. An ongoing measles outbreak at ICE's Camp East Montana detention facility in Texas compounds the crisis.
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