streptococcal empyema

strep·to·coc·cal em·py·e·ma

purulent exudation into the pleural cavity caused by infection with Streptococcus hemolyticus.
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During the pandemic influenza outbreak in 1918 there were numerous cases of acute streptococcal empyema. In this condition the pus is watery compared with the thick material seen in chronic empyema and the more common staphylococcal empyema.