According to South Korean scientists, in order to achieve a high level of immunity, you must first be immunized with AstraZeneca, and then with Pfizer.
So, almost 500 medical workers took part in the study. Specifically, 100 of them received mixed doses, 200 received two doses of Pfizer vaccine, and the rest received AstraZeneca.
After that, antibodies were found in all doctors, however, in those who underwent combined immunization, the level of protection against COVID-19 was higher.
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