A dose of the measles vaccine is seen on a table at a health center in Lubbock, Texas, on Feb. 27, 2025. A dose of the measles vaccine is seen on a table at a health center in Lubbock, Texas, on Feb.

As a measles outbreak in West Texas continues to grow, the response from US Health and Human Services Secretary Robert F. Kennedy Jr. has leaned heavily on treatment with vitamin A, as well as “good results” from the use of the steroid budesonide,