A bone marrow aspirate is examined for the presence of parasites from a patient who has been traveling in Latin America for several months and who came in contact with a triatomid bug. Which parasite will most likely be identified?
a. Trypanosoma cruzi
b. D. fragilis
c. Fasciola hepatica
d. Chilomastix mesnili
A
Bone marrow aspirates for Leishmania and T. cruzi amastigotes, or Plasmodium spp., require staining using any of the bloodstains (e.g., Giemsa, Wright's, Wright-Giemsa, rapid stains, Field). The examination of specimens may confirm an infection previously missed by examination of routine blood films. The transmission of T. cruzi is through the infected feces of the triatomid bug. The bug takes a blood meal and immediately defecates, and the human host scratches the infected feces into the bite site. Bug saliva contains an irritant that stimulates scratching.
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