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From the Document: While both the pandemic of 1918 and COVID-19 [coronavirus disease 2019] are respiratory diseases largely spread through the air by coughing or sneezing, the two pandemics are different in important ways The H1N1 influenza strain of 1918 had a very short incubation period--just 1 to 2 days--whereas the coronavirus incubation can stretch up to 2 weeks, and its spread is facilitated by asymptomatic carriers Moreover, the flu pandemic of a century ago would penetrate deep into a victim\'s lungs straightaway, and its virulence could trigger an overreaction by the immune system, filling the lungs with antibodies that caused acute respiratory distress As a result, victims were overwhelmingly the young and healthy This is the inverse of COVID-19\'s age profile, which targets those with weakened immune systems Despite these differences, lessons from the deadly pandemic of 1918 bear heeding today Influenza Epidemic (1918-1919);COVID-19 (Disease);Epidemics
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