El Salvador will begin administering a third dose of Covid-19 vaccine to various groups including the elderly, health workers and people with underlying health conditions, President Nayib Bukele said.

The Central American nation of roughly 6.4 million people has obtained some 12 million vaccines since February, Reuters reports.

Third shots would be given to people including those aged over 60, frontline health staff, teachers, the armed forces, police and firefighters, as well as Salvadorans with pre-existing health problems, Bukele said.