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COVID vaccines

Two Sinovac shots not enough for omicron, but 3rd shows effect

Double dose of Pfizer shows more protection than Chinese shot

A health worker prepares a dose of China's Sinovac shot in Jakarta on Dec. 10. Indonesia is one of dozens of countries that have received the jab.   © Reuters

SHANGHAI/HONG KONG -- Sinovac Biotech says that a third shot of its COVID-19 vaccine is 94% effective against the omicron variant, defending its jab after a study suggested the regular two-shot regimen provides inadequate protection.

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