1916 Pathologist Henrique da Rocha Lima identifies the causative agent (Rickettsia prowazeki) of epidemic typhus.
In 1909–10 he worked at the Institute for Maritime and Tropical Diseases in Hamburg, and from 1911 onward, served as a hydrozoologist and departmental head at the institute for hygiene in Frankfurt.
However, the illness remained poorly understood and Raab was placed in quarantine-like conditions in the Hamburg Tropical Institute.
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