HARVINDER SINGH / SCIENCE PHOTO LIBRARY HARVINDER SINGH / SCIENCE PHOTO LIBRARY
Salmonella bacteria in the intestine, computer illustration. These Gram-negative rod-shaped bacteria have flagellae (hair-like structures) which are used for locomotion. Salmonella bacteria can cause food poisoning when eaten in contaminated food. Symptoms may include abdominal pain, nausea, diarrhoea and vomiting.
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