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AstraZeneca 1st dose, Pfizer 2nd: Study says combination is safe and effective

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globalnews.ca

COVID-19 vaccines has found that giving a dose of Pfizer’s drug to people who already received a first shot of AstraZeneca vaccine is highly safe and effective, preliminary results showed on Tuesday.The Combivacs study, run by Spain’s state-backed Carlos III Health Institute, found the presence of IgG antibodies in the bloodstream was between 30 and 40 times higher in people who got the follow-up Pfizer shot than in a control group who only received one AstraZeneca dose.Meanwhile, the presence of neutralizing antibodies rose sevenfold after a Pfizer dose, significantly more than the doubling effect observed after a second AstraZeneca shot.

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