WHO: AstraZeneca-Pfizer vaccine mix acceptable only under specific condition

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Metro Manila (CNN Philippines, August 25) — A World Health Organization official on Tuesday laid down the only circumstance when countries can administer two different brands of COVID-19 vaccines.

WHO Essential Medicines and Health Technologies coordinator Dr. Socorro Escalante said those who received Oxford/AstraZeneca may receive Pfizer as their second shot only if supply is unavailable.

She said these two vaccine brands are the only combination that has been tested, adding it is safe and effective based on limited data from a study from United Kingdom.

"The mix and match of vaccines such as Astrazeneca and Pfizer will only be recommended when the second dose for AstraZeneca is unavailable. While we have vaccines for the second dose, we continue to advise countries to use the same vaccines," Escalante said in a media briefing.

The Philippines still hasn't allowed the mixing and matching of COVID-19 vaccines, but there is a plan to launch a clinical trial.