giardia intestinalis protozoan, 3d

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