Anthrax bacteria. Coloured transmission electron micrograph of Bacillus anthracis bacteria. B. anthracis is a Gram-positive, rod-shaped, spore- forming bacterium that causes the disease anthrax. It can infect the skin (cutaneous anthrax), causing raised itchy lesions, the lungs (pulmonary anthrax), which is fatal unless treated quickly, and the digestive system (gastrointestinal anthrax), causing vomiting of blood and severe diarrhoea. All forms can be fatal if left untreated. Treatment is with antibiotics.
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