Measles Exposure Alert Issued for Multiple Locations in Washington DC

DC Health announced an urgent public health alert after several confirmed measles cases were traced to different locations in Washington, D.C. The alert was issued on February 9, 2026, following investigation of multiple exposures.

Officials identified specific sites and dates where individuals may have been exposed to measles. These locations include the Basilica of the National Shrine of the Immaculate Conception on January 21, the National March for Life rally and concert on January 23, and several buildings at the Catholic University of America on January 24 and 25.

Additional exposure points were listed as Amtrak Northeast Regional Train 176 and the Amtrak Concourse at Union Station on January 27, as well as the Children’s National Medical Center Emergency Department on February 2. DC Health stated that people who were present at these sites during the specified times should be aware of possible exposure.

According to DC Health, individuals who are unvaccinated or immunocompromised and were at any of the identified locations are advised to watch for symptoms of measles and to contact their healthcare provider or the health department. The agency emphasized that people should call ahead before visiting a medical facility to reduce the risk of further transmission.

What the numbers show

• Alert issued on February 9, 2026
• Exposure dates range from January 21 to February 2, 2026
• Nine out of ten unvaccinated people exposed are likely to become infected

Measles symptoms generally develop between 7 and 14 days after exposure. Individuals are considered contagious from four days before the appearance of a rash to four days after it develops, according to DC Health guidance.

DC Health provided information about the typical progression of measles and the period during which individuals can spread the virus. The department’s alert aims to inform the public and help limit further exposures by encouraging preventive measures.

The health department’s recommendations focus on symptom monitoring and communication with healthcare providers for those at risk. The guidance specifically targets unvaccinated and immunocompromised individuals who may have been present at the identified sites during the exposure windows.

DC Health reiterated the importance of contacting healthcare providers by phone before visiting in person. This measure is intended to prevent additional exposures in medical settings and to facilitate appropriate care for those who may have contracted measles.

* This article is based on publicly available information at the time of writing.