A third booster dose of a COVID-19 vaccine made by AstraZeneca, Pfizer-BioNTech or Johnson & Johnson increases antibody levels significantly in those who have previously received two doses of Sinovac's CoronaVac shot, a study has found.
Vials of Chinese Sinovac's CoronaVac vaccine against coronavirus disease pictured inside the newly inaugurated production lab designated to manufacture the vaccine, in Constantine, Algeria September 29, 2021.
However, another study in December found that Sinovac's two-dose shot followed by a booster dose of Pfizer-BioNTech's vaccine showed a lower immune response against the Omicron variant compared with other strains.
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