Expert Advisory Board on Vaccine Prevention
Bulgarian Prof.: A Booster Dose is Given 6 Months after the Second
"There is no doubt in the effectiveness of the vaccines against the Delta variant of coronavirus, although this effectiveness has been reduced. There is no doubt in the reliability and effectiveness of the four vaccines approved for use in the EU and in Bulgaria against Covid-19," said Prof. Mariana Murdzheva, clinical immunologist and rector of MU-Plovdiv.