Mexico is set to start vaccinating several million education workers.

Starting April 20 and stretching through the end of May, the country hopes to inoculate more than 3 million education employees across Mexico, according to Hugo López-Gatell, a top coronavirus response official.

Teacher vaccinations in Sonora won’t start until the third round, which is expected to last a week starting May 5.

Vaccinations in general have been speeding up in recent days in Mexico, with now several days in a row of more than 500,000 doses administered. Well over 13 million doses have now been given, though the rate remains substantially slower than in the neighboring United States.