An unvaccinated adult who was a close contact of a known measles case in Weld County has now tested positive, and health officials say the ripple effect may reach into Larimer County. Two Larimer-area health centers have been flagged as potential public exposure sites, and anyone who was at the clinics on April 13 could develop symptoms through May 4. Public health investigators are urging people who are not vaccinated to watch for fever, cough, runny nose and red eyes, and to double-check their immunization records.
Where Exposures May Have Happened
State investigators have identified two Larimer County health facilities as possible exposure locations on April 13: the emergency department at Banner Fort Collins Medical Center and UCHealth Primary Care Johnstown. According to The Denver Post, the exposure window at Banner Fort Collins Medical Center was 3:35–6:10 p.m., and at UCHealth Primary Care Johnstown it was 3:15–5:20 p.m., both on April 13.
What Public Health Officials Are Advising
Local and state health officials say anyone who was exposed and is not immune should monitor for symptoms for 21 days after the exposure date and may be asked to quarantine to slow any further spread. The Colorado Department of Public Health and Environment recommends getting an MMR vaccine within 72 hours of exposure to cut the odds of getting sick and notes that immunoglobulin can prevent or reduce illness if given within six days. The CDC adds that the measles virus can linger in the air and remain infectious for up to two hours. For more details on monitoring and post-exposure options, see CDPHE and the CDC.
Why This Matters In Northern Colorado
Public health officials say this is another import-linked measles case showing up amid a broader rise in measles activity across Colorado, with many of the recent infections in people who were not vaccinated. State notices and local reporting have repeatedly urged Coloradans to review their vaccination records and consider early MMR doses when appropriate. For more background on the recent trend, see reporting by The Colorado Sun.
If you were at either facility during the listed time windows, officials say you should confirm your MMR vaccination history and call your health care provider before going to a clinic if you start to develop symptoms. Calling ahead gives staff a chance to isolate you quickly and cut down on any new exposures. Those with questions or concerns can contact their local public health agency or CDPHE at 720-653-3369 for guidance on testing, quarantine and post-exposure prophylaxis, per CDPHE. The CDC’s measles advisory outlines timing for MMR and immunoglobulin after exposure and offers testing and infection-control guidance for clinicians; see the CDC for more information.
