giardia lamblia protozoan, the causative agent of giardiasis

giardia parasites lamblia intestinal illustration giardiasis villi protozoan 3d background protozoa lambliasis medical medicine microbe microbiology microorganism microscopic parasite parasitic parasitology science scientific small stomach system jejunum invasion intestine flagella colon diarrhea colour infectious cell body trophozoite abdominal duodenalis biology duodenum disease infection digestive human ileum intestinalis anatomy