reuters.com/business/healthcare-pharmaceuticals/sinovac-covid-19-shot-with-pfizer-booster-less-effective-against-omicron-study-2021-12-31
Sinovac's COVID-19 vaccine followed by a Pfizer-BioNTech shot showed a lower immune response against the Omicron variant compared with other strains. The study, which has not been peer-reviewed yet, was conducted by researchers from Yale University, the Dominican Republic's Ministry of Health and other institutions.

Antibody levels against Omicron were 6.3-fold lower when compared with the ancestral variant. Two-dose Sinovac vaccine alone did not show any detectable neutralization. A study from Hong Kong last week said that even three doses of the Sinovacs vaccine did not produce enough antibody response.

Sinovac's CoronaVac and state-owned Sinopharm's BBIBP-CorV vaccine are the two most-used vaccines in China. Hong Kong has been using the Sinovac and Pfizer-BioNTech vaccines. read more at: www.dailymail.co.uk.
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