In addition to other findings, what cytologic finding supports a diagnosis of equine piroplasmosis?

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Multiple Choice

In addition to other findings, what cytologic finding supports a diagnosis of equine piroplasmosis?

Seeing intraerythrocytic piroplasms on a Giemsa-stained blood smear is the key cytologic finding that supports equine piroplasmosis. The parasite lives inside red blood cells, so a stained smear can reveal small intracellular organisms within RBCs, directly indicating infection. This cytologic evidence is more specific than nonspecific signs like renal failure or autoimmune markers such as a positive Coombs test, and it supersedes a negative smear, which would argue against the diagnosis. In practice, diagnosis is reinforced with serology or PCR, but the presence of infected red blood cells on a Giemsa stain provides the strongest cytologic confirmation.

Seeing intraerythrocytic piroplasms on a Giemsa-stained blood smear is the key cytologic finding that supports equine piroplasmosis. The parasite lives inside red blood cells, so a stained smear can reveal small intracellular organisms within RBCs, directly indicating infection. This cytologic evidence is more specific than nonspecific signs like renal failure or autoimmune markers such as a positive Coombs test, and it supersedes a negative smear, which would argue against the diagnosis. In practice, diagnosis is reinforced with serology or PCR, but the presence of infected red blood cells on a Giemsa stain provides the strongest cytologic confirmation.

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