As of today arrivals in Austria from Bulgaria will be placed under 10-day quarantine. They will also have to fill out a declaration describing where they will spend the quarantine.  

Quarantine may be terminated no earlier than the 5th day of quarantine upon presentation of a negative result of a PCR or antigen test for SARS-CoV-2.

Persons travelling for medical or professions reasons are exempt from quarantine if, upon entry, they present a medical certificate confirming a negative result of a PCR or antigen test taken no earlier than 72 hours prior to entering Austria.