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It was 1928 when Scottish scientist Alexander Fleming noticed an odd phenomenon: Mould that had formed accidentally in one of his petri dishes was stopping the growth of bacteria.
Fleming had of course just discovered penicillin, and by the mid-1940s the world’s first antibiotic would be in mass production, launching an historic era when most bacterial infections became curable.
As COVID-19 has made painfully clear, viral diseases are a rather different matter.
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