Mexico’s president says that efforts to provide boosters to elderly Mexicans is continuing, and that others could soon qualify.

“The decision has been made to apply the booster vaccine to all teachers,” President Andres Manuel Lopez Obrador said during his Wednesday morning press conference.

But teachers, along with medical personnel, may have to wait until the booster effort for elderly citizens concludes, as is nearly the case in Mexico City, according to AMLO, as the president is widely known.

In the Sonoran capital Hermosillo, some 53,000 older residents have gotten a booster, and additional efforts are planned in December for other cities, according to federal officials. As of last week, 83% of Sonoran adults have received at least one vaccine dose, slightly below the nationwide figure.

Many teachers in Mexico received the Cansino vaccine, which is not among the vaccines that U.S. authorities recognize for being able to cross into the United States.