Ключевые слова: 3d, cells, contamination, dangerous, disease, duodenalis, duodenum, flagella, germs, giardia, giardiasis, illustration, infection, infectious, intestinalis, invasion, lamblia, microbe, microscopic, parasite, parasites, parasitic, parasitology, pathogen, pathogenic, pathogens, protozoa, protozoan, trophozoite, water, water borne, waterborne,