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NewsColony Link between BCG and lower COVID-19 mortality disproved by new analysis The association between BCG (Bacillus Calmette-Guérin) vaccination and its purported beneficial effect on COVID-19 transmission/mortality rates was challenged in an expert appraisal of Diamond Princess cruise ship data. At the same time, cross-national differences previously reported were shown to be flawed, reports a new medRxiv study. A global pandemic of coronavirus disease (COVID-19) caused by severe acute respiratory coronavirus 2 (SARS-CoV-2) represents an international public health crisis. Since there is still no vaccine or effective treatment modality, the scientific community explores different options to lessen the infection burden. Recently, several author groups have proposed the hypothesis that BCG vaccination reduces both the morbidity and mortality of COVID-19. A correlation between national BCG vaccination policies and infection rates arguably supported this hypothesis. The assumpt...