The World Health Organization (WHO) recommends making a coronavirus vaccination with two doses of one vaccine, since the consequences of the use of different vaccines have not yet been studied. This was stated during the issues broadcasting in Twitter and answers, the head of the WHO Cate O’Brien’s immunization department, TASS reports.
She reported that there is only data on the possibility of “mixed” immunization in the event of a dose of the Vaccine of the American company Pfizer after the first vaccination was made by the Vaccine of the British-Swedish company Astrazeneca. “We have a permitting recommendation on this issue,” O’Brien explained.
“However, in addition to this case, we have no data yet as to whether the immune response will remain in the case of a mixed vaccination schedule, and whether it will be used safely,” it emphasized. “Studies continue, and we expect to obtain data on this score in the coming months,” continued the leader of the WHO Department. “At the present moment, we still recommend that in cases where two doses are required, the same vaccine has been used for both doses,” it stated.
On the question of the duration of the protection against coronavirus during vaccination, O’Brien did not give a direct response, noting that the research “go” in this area. She recalled that COVID-19 vaccines were developed only “about a year ago”, so “it takes time to conduct monitoring” and, among other things, find out how long antibodies are preserved.