Common non-pathogenic commensal of human Habitat in human: Large intestines Trophozoites detected in faecal specimens of infected human Diagnostic Features Live parasites show sluggish movements Size: 20 – 25 µm (range 15 to 50 µm) – larger than E. histolytica Shape: Irregular with blunt pseudopodia Nucleus: One nucleus; Peripheral chromatin granules: irregularly distributed & coarse […]

Cyst is the infective stage to human Cysts detected in faecal specimens of infected human Diagnostic Features Shape: Spherical Size: 12 – 15 mm (range 10 – 20µm) Nuclei: Mature cyst contains 4 nuclei; Centrally located small karyosome in nucleus; Peripheral chromatin is fine and uniformly distributed Chromatoid bodies with bluntly rounded ends may be […]

Habitat in human: Large intestines – colon and rectum Trophozoites detected in faecal specimens of infected human Diagnostic Features Show active amoeboid movement, when live Size: 15 – 20 µm (range 10 – 60 µm) Shape: Irregular with finger-like pseudopodia 01 nucleus; Evenly distributed peripheral chromatin on nuclear membrane Small, centrally located karyosome in nucleus […]