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Study finds AstraZeneca dose followed by Pfizer COVID-19 dose is safe and effective

Posted: Tuesday, May 18, 2021. 11:28 am CST.

By Zoila Palma: A recent study done in Spain showed that it is safe and effective for people who received their first shot- AstraZeneca vaccine and then received their 2nd shot in a Pfizer vaccine, Reuters report.

The Combivacs study said that it 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.

Over 600 volunteers between the ages of 18-59 had already received a first dose of AstraZeneca’s vaccine participated in the study.

Only 1 % of the participants reported severe side effects.

The study was done to determine how best to proceed after limiting AstraZeneca’s shot to people aged over 60 due to concerns about blood clotting in younger people.


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