According to Order № RD-01-278/29.04.2021 of the Minister of Health, as of 1st May 2021 to 31th May 2021, all citizens (except these mentioned in article 1 in the Order), Bulgarian nationals, nationals of the European Union and the Schengen Agreement States (including San Marino, Andorra, Monaco and Vatican City), and their family members or persons who are in actual cohabitation with them; citizens of the United Kingdom and Northern Ireland, Australia, Canada, the United States of America, Japan, New Zealand, China, Rwanda, the Republic of Korea, Thailand, Tunisia, Uruguay, the United Arab Emirates, Georgia, Ukraine, North Macedonia, Serbia, Albania, Kosovo, Bosnia and Herzegovina, Montenegro, Moldova, Russia, Israel, Kuwait, the Republic of Belarus, and Turkey; persons with permanent or long-term resident status in Bulgaria (and their family members); persons who hold Bulgarian visa type “D” for long-term residence; persons with resident status (and their family members) of Member States of the European Union, the Schengen Agreement States (including San Marino, Andorra, Monaco and Vatican City) and their family members may enter Bulgaria by presenting one of the following documents:
(a) a vaccination certificate for a completed vaccination course against COVID-19. The vaccination certificate is considered valid 14 days after receiving the final dose. The document should include full name of the vaccinated person as per the identification document, date of birth, dates the vaccine doses were administered, vaccine name and batch number, name of the producer, details of the vaccine certificate issuing authority and country;
(b) a positive result from a PCR or antigen test for immunity for COVID-19 for persons who had the coronavirus infection not more than 6 months from the date they enter the country;
(c) a negative result from a PCR test performed within 72 hours of their entry into the country or a negative antigen test performed within 48 hours of their entry into the country;
Read the full text in Bulgarian of the order here to find out what are the exceptions for entering the country and the specific requirements of the health authorities.