The safety requirements for vaccines are much higher than for medicines. However, there is still very little information about the Covid-19 vaccine. Mass vaccination in Bulgaria will probably start in two months at the earliest, said Associate Professor Svetlana Velizarova, Head of the Children's Clinic at Pulmonary Hospital “St. Sofia” in an interview for BNR. 

“Medics and teachers should be among the first to take Covid-19 vaccines so students can go back to the classroom for in-person studies”, Associate Professor Velizarova went on to say. "People over 65 should receive vaccine right after the first group," the doctor added.