Prime Minister of Bulgaria Boyko Borisov says he self-isolated after finding out that Deputy Minister of Regional Development and Public Works Nikolay Nankov has tested positive for COVID-19, RIA Novosti reports, citing Sofia Globe.

According to Sofia Globe, Borisov found out about Nankov’s positive result on Friday at 4 p.m. As for Borisov, he has tested negative.

Borisov added that the last time he had contact with Nankov was five days ago.