Wright-Giemsa stain morula

Wright-Giemsa stain of a buffy coat specimen revealed the presence of a morula, or cluster of intracellular coccobacilli, inside of a polymorphonuclear leukocyte (arrow).

Reproduced with permission from: Donato, AA, Chaudhary, A. Photo Quiz: A 78-Year-Old Man with the "Summer Flu" and Cytopenias. Clin Infect Dis 2009; 48:1433. Copyright ©2009 University of Chicago Press.

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