Unvaccinated Infant Becomes San Francisco's First Measles Case in Seven Years

San Francisco health officials confirmed Wednesday that an unvaccinated infant has been diagnosed with measles, marking the city's first reported case of the disease since 2019.

The case was announced by the San Francisco Department of Public Health, which is now working to identify anyone who may have been exposed to the infected child. Officials have not disclosed the infant's age or the circumstances surrounding the diagnosis.

Measles is a highly contagious viral illness spread through the air when an infected person coughs or sneezes. The virus can linger in the air for up to two hours after an infected person has left a room, making exposure tracking a significant public health challenge.

Health officials are urging residents, particularly parents of young children, to ensure their vaccinations are up to date. The measles-mumps-rubella, or MMR, vaccine is considered highly effective, with two doses providing approximately 97 percent protection against the disease.

The case comes amid a broader national uptick in measles activity, with outbreaks reported in several states in recent months. Public health experts have linked the trend to declining vaccination rates and increased global travel.

San Francisco officials emphasized that the risk to the general public remains low for those who are fully vaccinated. However, they warned that infants too young to be vaccinated and immunocompromised individuals face a heightened risk of serious complications from the disease.

Anyone who believes they may have been exposed or who is unsure of their vaccination status is encouraged to contact their healthcare provider or the San Francisco Department of Public Health for guidance.