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Covid vaccine in UAE: Immunity takes time to kick in after jab, say doctors Nandini Sircar/Dubai Photo: Shihab/KT People can be exposed to Covid right before being vaccinated, or right after, and there may not be time for the body to boost its defenses. It takes time for vaccines to build up immunity, and the two authorised coronavirus vaccines in the country require two doses before the immunity to develop, UAE doctors have said. Immunity does not kick in right away given the two doses both of the Pfizer-BioNTech and Sinopharm vaccines are administered several weeks apart, to train the body s immune system. ....