DR GARY GAUGLER / SCIENCE PHOTO LIBRARY DR GARY GAUGLER / SCIENCE PHOTO LIBRARY
Giardia lamblia protozoan. Coloured scanning electron micrograph (SEM) of a Giardia lamblia protozoan cyst (green), the cause of the disease giardiasis in humans. Several unidentified bacteria are also seen. This parasite infects the small intestine when the cyst is ingested. The sporozoite stage (not seen) attaches to the intestinal lining using sucking discs. Giardiasis is most common in tropical areas, being spread by direct contact with an infected individual or through contaminated food or water. Symptoms include abdominal cramps, swelling, diarrhoea and vomiting. Severe cases may be treated with antibiotic drugs. Magnification unknown.
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