AMI IMAGES / SCIENCE PHOTO LIBRARY AMI IMAGES / SCIENCE PHOTO LIBRARY
Giardia lamblia protozoan dividing. Coloured scanning electron micrograph (SEM) of a single Giardia protozoan about to become two separate organisms during a late stage of cell division (binary fission). Giardia are single-celled parasites of the intestinal tract. They are most common in tropical regions and have flagella (hair-like structures), which are used for locomotion. Giardia lamblia is the causative agent of giardiasis, an intestinal disease that causes abdominal pain, diarrhoea and nausea. It is spread through contaminated food and water. Treatment is with antibiotics or antiprotozoal drugs, such as metronidazole.
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