ABSTRACT
Flagellate trophozoites and cysts in feces of cats acquired by ingestion of infectious cyst. PPP= 5 to 7 days. Dx: Trophozoites and cysts in feces. Trophozoites more common in loose stools; tennis-racket or tear-drop shaped (10 to 17 µm long), two nuclei in the wider end, 8 trailing flagella, motile in saline preparations and have a gliding motion. Cysts most common in formed stools; ellipsoid, clear, and contain 4 nuclei; (about 10 µm long). Habitat: Small intestinal mucosa (surface). Similar Species: Trophozoites must be distinguished from Pentatrichomonas. Cysts can be confused with sporocysts of Sarcocystis and oocysts of coccidian. Range: World. Clinical Signs: Usually asymptomatic, but can show small bowel diarrhea, often with high fat content. Potential Zoonosis: Giardia felis can be transmitted to humans, but humans typically acquire infections from other humans. Routine precautions should be taken when handling feline fecal matter. Tx: No approved drug. Benzimidazoles used most commonly now. Fenbendazole (Panacur) works at labeled dosage. Drontal and Albendazole have been used.
