The Com-Cov trial, led by researchers from the University of Oxford, looked at the efficacy of either two doses of Pfizer, two of AstraZeneca, or one of them followed by the other
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"Mixing doses could provide us with even greater flexibility for a booster programme, while also supporting countries who have further to go with their vaccine rollouts, and who may be experiencing supply difficulties," UK's deputy chief medical officer, Prof Jonathan Van-Tam, was quoted as saying by the BBC. Two doses are important to give the fullest protection and teach the body to make antibodies and T cells to block and kill Covid. Meanwhile, a pre-print study suggests that a third dose of AstraZeneca vaccine, given more than six months after the second, boosts the immune system, the BBC reported. But, there is currently no data to support that a Covid-19 vaccine booster shot is needed for the general population, according to the US Centers for Disease Control and Prevention. An extra dose may be needed for more-vulnerable groups, such as older adults or organ transplant patients.
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