A growing measles outbreak in Texas is being driven largely by cases inside federal immigration detention facilities, raising concerns among public health officials about containment and oversight.
State health officials have reported about 147 measles cases so far in 2026, with the majority linked to detention centers, particularly in West Texas. The largest cluster has been identified in a facility in Hudspeth County, where more than 100 cases have been recorded.
Health experts say detention facilities can be especially vulnerable to outbreaks of highly contagious diseases like measles due to crowded living conditions, frequent population turnover and inconsistent vaccination histories among detainees.
Additional cases have been reported in other parts of the state, including South Texas facilities that house families and children, as well as in surrounding communities. Counties such as El Paso, Bexar and Lubbock have reported infections, though officials say it remains unclear how many of those cases are directly tied to detention centers.
Measles is one of the most contagious viruses, spreading through the air when an infected person coughs or sneezes. Even a small number of cases can quickly escalate in confined environments.
The outbreak has also highlighted jurisdictional challenges. Local health departments have limited authority over federal detention facilities, which are overseen by national agencies or private contractors. That has complicated efforts to monitor conditions and implement public health measures, according to officials.
Earlier this year, even a handful of measles cases prompted quarantines and movement restrictions within some facilities, underscoring how quickly the virus can spread in those settings.
The situation has drawn attention from policymakers and public health advocates, who say the outbreak underscores the intersection of immigration policy and disease control. Concerns include access to vaccinations, medical care for detainees and the potential for the virus to spread beyond facility walls through staff, visitors or released individuals.
Texas experienced a major measles outbreak in 2025, and the current surge suggests the virus continues to pose a threat, particularly among populations with lower vaccination rates.
Health officials say they are continuing to monitor the outbreak and urge vaccination as the most effective way to prevent the spread of measles.