New York City health officials are on high alert after detecting measles at a migrant shelter in Brooklyn.
Two people have tested positive for the highly contagious disease at the Clinton Hill shelter, which houses around 3,000 migrants seeking legal entry into the US.
Officials at the NYC Department of Health and Mental Hygiene are coordinating with local hospitals and have quarantined the patients on a single floor of the facility.
Asylum seekers are not required to be immunized when they reach the US, meaning many may not be up to date on vaccinations the CDC considers essential.
The cases come on the heels of another in a Chicago migrant shelter in May, where a single case led to an outbreak of 57 cases in the city. Outbreaks of other diseases have also been recorded in migrant shelters across the US in recent years.