The best thing people who have received the first dose of AstraZeneca can do, is to continue and complete the immunization with the same vaccine. This will fulfill the vaccination process properly and in line with clinical trials which are made for this vaccine. “If they want my advice - that is - to continue with this vaccine, of course as long as they do not have any serious consequences after the first dose. “ These are the words of member of the National Vaccination Task Force Prof. Dr. Mariana Murdzheva. "There is no research and data on the effectiveness of mixing two types of vaccines. The mechanism of action of these drugs is different because they use different platforms, although the ultimate goal is the same," added Prof. Murdzheva.