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MRSA bacteria, Animated colored scanning electron micro-graph (SEM). Methicillin-resistant Staphylococcus aureus (MRSA, yellow) is a Gram-positive, round (coccus) bacterium. It is resistant to many commonly prescribed antibiotics. S. aureus 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.Animated scanning electron micrograph (SEM) of Staphylococcus aureus bacteria. These Gram-positive coccus (round) bacteria are found on the skin and mucous membranes of humans and many animals. The bacteria are usually harmless, but infections can occur on broken skin or within a blocked sweat or sebaceous gland, resulting in boils, pustules and abscesses. S. aureus can also cause food poisoning, producing toxins that induce vomiting. Certain strains cause the potentially fatal toxic shock syndrome (TSS).