27.1 MB (3.0 MB compressed)
3070 x 3091 pixels
25.9 x 26.2 cm ⏐ 10.2 x 10.3 in (300dpi)
SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Crab and prawns. Certain foods, including shellfish, contain substances which can cause an allergic reaction in some people. Antibodies are normally produced in response to infection with microbes and their toxins. Sometimes the immune system responds in the same way to harmless substances (chemicals in foods, house dust and pollen for example). Once the body has become sensitised in this way subsequent exposure to the allergen (the allergy-causing substance) produces an unpleasant reaction. Food allergies can produce symptoms such as eczema, asthma, vomiting and diarrhoea.
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