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MRSA bacteria. Coloured scanning electron micrograph (SEM) of methicillin-resistant Staphylococcus aureus (MRSA, round) on the microscopic fibres of a wound dressing. MRSA is a gram-positive, round (coccus) bacterium that is resistant to many commonly prescribed antibiotics. It is carried by around 30 per cent of the population without causing any symptoms. However, in vulnerable people, such as those that have recently had surgery, it can cause wound infections, pneumonia and blood poisoning. Magnification: x8700 when printed at 10 centimetres wide.
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