Bacterial Pneumonia Caused Most Deaths in 1918 Influenza Pandemic

pues eso:

deaths were not caused directly by the then-unidentified influenza virus, but rather resulted from severe secondary pneumonia caused by various bacteria

la mayor parte de los millones de muertes que provocó la "gripe española" (que ni era gripe, ni era española) se deben a bacteria pneumococo..

no se podía "de saber"..

Bacterial Pneumonia Caused Most Deaths in 1918 Influenza Pandemic