 Chagas named the pathogenic parasite as Trypanosoma cruzi and later that year as Schizotrypanum cruzi , both honoring Oswaldo Cruz , the noted Brazilian physician and epidemiologist who successfully fought epidemics of yellow fever , smallpox , and bubonic plague in Rio de Janeiro and other cities in the beginning of the 20th century . Chagas was also the first to unknowingly discover and illustrate the parasitic fungal genus Pneumocystis , later infamously linked to PCP ( Pneumocystis pneumonia in AIDS victims ) . Confusion between the two pathogens ' life @-@ cycles led him to briefly recognize his genus Schizotrypanum , but following the description of Pneumocystis by others as an independent genus , Chagas returned to the use of the name Trypanosoma cruzi . 
 Chagas<a href='been_done' title='1'><mark></mark></a> named the pathogenic parasite as Trypanosoma cruzi and later that year as Schizotrypanum cruzi , both honoring Oswaldo Cruz , the noted Brazilian physician and epidemiologist <a href='null_relcl' title='2'><mark>who</mark></a>successfully fought epidemics of yellow fever , smallpox , and bubonic plague in Rio de Janeiro and other cities in the beginning of the 20th century . Chagas was also the first to unknowingly discover and illustrate the parasitic fungal genus Pneumocystis , later infamously linked to PCP ( Pneumocystis pneumonia in AIDS victims ) . Confusion between the two pathogens <a href='null_genetive' title='3'><mark>'</mark></a>life @-@ cycles led him to briefly recognize his genus Schizotrypanum , but following the description of Pneumocystis by others as an independent genus , Chagas returned to the use of the name Trypanosoma cruzi . 
Chagas done named da pathogenic parasite as Trypanosoma cruzi and later dat year as Schizotrypanum cruzi , both honoring Oswaldo Cruz , the noted Brazilian physician and epidemiologist successfully fought epidemics of yellow fever , smallpox , and bubonic plague in Rio de Janeiro and other cities in tdabeginning of the 20th century . Chagas was also the first to unknowingly discover and illustrate the parasitic fungal genus Pneumocystis , later infamously linked to PCP ( Pneumocystis pneumonia in AIDS victims ) . Confusion between the 2 pathogens  life @-@ cycles led him to briefly recognize his genus Schizotrypanum , but following the description of Pneumocystis by others as an independent genus , Chagas returned to the use of thdaame Trypanosoma cruzi .