Fig 1.

Photomicrographs of kidney sections showing Babesia-like organisms. (A) Single, small, round-to-oval intracellular organism with light-blue cytoplasm and an eccentric purple nucleus (signet ring-shaped) in an erythrocyte within the vasa recta of formalin-fixed renal tissue from a free-roaming cat in Hong Kong (hematoxylin and eosin [H&E] staining; original magnification, ×1,000). (B) Single, small, round-to-oval intracellular organism with light-blue cytoplasm in two erythrocytes within the vasa recta of formalin-fixed renal tissue (Giemsa staining; original magnification, ×1,000).