"A second dose of a different Covid-19 vaccine cannot be administered; there are no clinical studies that this would be effective," Assoc. Prof. Dr. Mihail Okoliyski, representative of the World Health Organization for Bulgaria, has told BNT.

Yesterday, the Minister of Health Prof. Kostadin Angelov said that the Oxford-AstraZeneca vaccine could be withdrawn, as interest in it has greatly dropped. According to the WHO representative, no one realized that the coronavirus would affect the psychological functioning of the patients who overcame the illness and that one out of three would develop some kind of psychological problem. A multi-level solution must be found, as this is not just a problem of the healthcare system, he said. "A legislative initiative is needed to ensure the safety of vulnerable groups," Assoc. Prof. Mihail Okoliyski added.