MADRID — Spain will begin using the AstraZeneca vaccine for essential workers such as police, fire fighters and the military.

Vaccine guidelines were published Wednesday by Spanish health authorities. They are expected to be approved later in the day by regional health officials for the AstraZeneca shots and the Pfizer and Moderna vaccines. The latter two already have been given to vulnerable groups, including the elderly and infirm.

The guidance says the AstraZeneca vaccine shouldn’t be given to people over 55 years or people with serious illness, because there is no data to show it works on them.

In line for the AstraZeneca vaccine are teachers and staff at nursery, primary and secondary schools, pharmacies, day centers for the elderly and those who provide home help for the elderly.