Staphylococcus aureus is a bacterium that's a common coloniser of human skin and mucosa. It can cause disease, particularly if there's an opportunity for the bacteria to enter the body. Illnesses that may develop include skin infections, wound infections, urinary tract infections, pneumonia, bacteraemia and bloodstream infections.
Since 2001, Scotland has had a mandatory MRSA bacteraemia surveillance programme which publishes quarterly reports of the numbers and rates of MRSA bacteraemias. In 2006 the programme was extended to include meticillin sensitive S. aureus (MSSA) bacteraemias. In 2014 it expanded again to include enhanced staphylococcus aureus bacteraemia (SAB) surveillance.