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, where it was noted the trial could not “test the efficacy among those with chronic diseases, women, older adults”). With no data available, the effectiveness of Sinovac against new Covid-19 variants is unknown. What isof other vaccines against the Delta variant is a marked drop in protection with only one dose and a more limited drop once fully immunized. Even a small drop in efficacy would take Sinovac’s shot below the WHO threshold.
the poor efficacy of China’s vaccines at a conference in April, in what seemed to be an unintentional dissent from the party line. Gao said the country was exploring ways to “solve the problem that the efficacy of the existing vaccines is not high.” China swiftly rejected the way Gao’s comments had been perceived on the domestic and international stage, flushing comments from social media and publicly rebuking the statement.
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