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  2. 1924 Los Angeles pneumonic plague outbreak - Wikipedia

    en.wikipedia.org/wiki/1924_Los_Angeles_pneumonic...

    The pneumonic plague's potency of person-to-person transmission is disputed [55] – it is agreed that Yersinia pestis can spread the pneumonic plague through aerosol transmission of infected droplets, and the bacterium can survive in the air for up to one hour in optimum conditions.