Four people who received the Pfizer vaccine in Bulgaria experienced side effects after the injection.
This was announced by the head of the Executive Agency for Medicines, Bogdan Kirilov reports Radio Bulgaria.
According to him, the messages came after five thousand people were vaccinated.
People experienced pain and dizziness, as well as soreness at the injection site and fever for several hours. Then the symptoms went away.
Pfizer and its German partner BioNTech are pioneers in the development of a vaccine against COVID-19. The development efficiency is about 95%.
One of the disadvantages of the Pfizer / BioNTech vaccine is its storage conditions — before shipment, the capsules are placed in boxes at a temperature of about -70 degrees Celsius, after which it goes to distribution centers in specially designed refrigerated boxes with dry ice.