Infectious disease experts and health regulators had recognized the deadly potential of pathogenic priming since the 1980s, when one study showed that “more severe responses were found to be 15–80 times more likely in secondary dengue infections than in primary infections.”117 In 2004, an experimental MERS vaccine had produced robust antibody response in children during an NIH trial and then catastrophic illness and death when researchers exposed the children to wild virus.118 Similarly in 2012 and 2014, a collaborative of Chinese and US researchers had developed coronavirus vaccines that
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