Giardia lamblia, a human parasite of the gastrointestinal tract, coloured scanning electron micrograph (SEM). The organism is spread by direct contact or through contaminated food and water. Giardia spp. They cause the disease giardiasis (or lambliasis), an infection of the small intestine most common in tropical areas. Giardia spp. Abdominal cramps, swelling, diarrhoea and nausea may occur. Magnification: x1,200 when shortest axis printed at 25 millimetres.
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