A Hong Kong pharmacologist has said no evidence existed to conclusively prove the Sinovac vaccine against Covid-19 caused a heart blockage that killed a chronically ill man but acknowledged the jab could be a potential factor that accelerated his death.Bernard Cheung Man-yung told the Coroner’s Court on Thursday that the vaccine did not directly contribute to the death of Timble Li Yu-kun. But he acknowledged the possibility of the dose being the “last straw” for the 63-year-old with recurring…

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