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Download 3 MSSA Staphylococcus aureus is a bacterium that commonly
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MSSA Staphylococcus aureus is a bacterium that commonly colonises human skin and mucosa (e.g. inside the nose) without causing any problems. It can also cause disease, particularly if there is an opportunity for the bacteria to enter the body, for example through broken skin or a medical procedure. Most strains of S. aureus are sensitive to the more commonly used antibiotics, and infections can be effectively treated. Some S. aureus bacteria are more resistant. Those resistant to the antibiotic meticillin are termed meticillinresistant Staphylococcus aureus (MRSA) and often require different types of antibiotic to treat them. Those that are sensitive to meticillin are termed meticillin-sensitive Staphylococcus aureus (MSSA). MRSA and MSSA only differ in their degree of antibiotic resistance: other than that there is no real difference between them. (HPA website) Since January 2011 the Trust has reported the number of MSSA bacteraemias to the Health Protection Agency. Bacteraemia occurs when bacteria get into the bloodstream. There are no current targets attached to this reporting and it is being used to gain additional information on the background and causes of the infection. E coli Most strains of Escherichia coli form part of the normal intestinal microflora in humans and warm-blooded animals. However, some strains have the ability to cause disease in humans through the presence of specific virulence factors (HPA website). These diseases include infections outside the intestinal tract such as urinary tract infections (UTIs), and bacteraemia. Since June 2011 as part of ongoing information gathering the Trust has submitted data on E coli bacteraemia to the HPA. In a similar way to MSSA it is then hoped to provide further information on the incidence and causes of the bacteraemia 3