FDA reviews 4 brands for booster and additional shots, possible mix and match

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Metro Manila (CNN Philippines, November 3) — Regulatory experts are looking into the applications to amend the authorization given to Pfizer, AstraZeneca, Sinovac, and Sputnik V to include its use as booster vaccine shots or additional COVID-19 doses.

"Nag-request sila na ma-include ang third dose sa kanilang regimen o booster dose. Pinadala ang scientific data available at ito ang inaaral ngayon ng experts," Food and Drug Administration Director General Eric Domingo said in a taped address that aired on Wednesday.

[Translation: They requested that use for third dose or booster dose be included in the emergency use authorization. Experts are now studying the scientific data they sent.]

The official said the FDA is also studying mixing and matching certain COVID-19 vaccine brands for booster shots, as requested by the Department of Health.

Domingo said they are looking into the safety and efficacy of mixing the complete dose of AstraZeneca then Pfizer as the third dose, Sinovac then Pfizer or AstraZeneca, and Moderna then Pfizer as the booster shot.

Vaccine czar Carlito Galvez Jr. gave the projected timeline for the administration for booster dose for healthcare workers and third shot for senior citizens and immunocompromised individuals or those with impaired immunity due to illness.

He said they are hoping to release the final guidelines for booster and third shots by Nov. 5 and implement it by Nov. 15. But Galvez added the government will only give the shots after securing an amended emergency use authorization from FDA and the World Health Organization's Strategic Advisory Group of Experts on Immunization releases its recommendation.

"Magkakaroon po tayo ng simultaneous sa Nov. 15 if all the requirements na EUA revision and also the SAGE recommendation will be published not later than Nov. 15, hihintayin natin iyon," he said.

[Translation: It will be simultaneously rolled out on Nov. 15 if the revised EUA and SAGE recommendation will be published not later than Nov. 15. We will wait for those.]

Booster shots are given to those whose immunity is going down over time after completing their shots. An additional dose is for individuals who never reached the ideal immune response level and are usually the elderly or those with impaired immunity.