Some countries, including Turkey and the United Arab Emirates, have already started giving a booster shot to those inoculated with Chinese vaccines amid concerns that they may not be as effective against new and more transmissible coronavirus variants.
While some real-world data showed the Sinovac vaccine is effective against hospitalization and severe COVID-19 cases, there is no detailed data yet on its effectiveness against the Delta variant, first identified in India.
Thailand, which expects to receive a donation of 1.5 million Pfizer-BioNtech (PFE.N), (22UAy.DE) shots from the United States later this month, plans to use it in inoculating its 700,000 medical workers. Most of them have already received two shots of Sinovac.
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