Table of contents

March 2011 - Volume 60 - 3

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Salmonella bacteria (green), coloured scanning electron micrograph (SEM). Salmonella bacteria can cause food poisoning when they are eaten in contaminated food. Symptoms include abdominal pain, nausea, diarrhoea and vomiting. Magnification: ×8700 when printed 10 centimetres wide. Cover credit: NIAID / CDC / SCIENCE PHOTO LIBRARY.