DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
MRSA bacteria, coloured scanning electron micrograph (SEM). Methicillin-resistant Staphylococcus aureus (MRSA) is a Gram-positive, round (coccus) bacterium. It is resistant to many commonly prescribed antibiotics. S. aureus is carried by around 30% 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: x5400 when printed at 10 centimetres wide.
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