Giardia lamblia. Coloured Scanning Electron Micro- graph (SEM) of the parasite Giardia lamblia in the human small intestine. A number of these single- celled protozoans are seen (green); pear-shaped, they have flagellae for motility. They cause the disease giardiasis (or lambliasis), an infection of the small intestine most common in tropical areas. Giardia lamblia attaches by means of sucking discs to microvilli in the human intestine. Abdominal cramps, swelling, diarrhoea and nausea may occur. The organism is spread by direct contact or through contaminated food and water. Magnification: x3,800 at 6x7cm. x4,860 at 4x5ins

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