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A new strain of MRSA has been identified in cows' milk and in people, but don't stop drinking milk - the bug is killed off in pasteurisation. However, the strain evades detection by standard tests used by some hospitals to screen for MRSA (methicillin-resistant Staphylococcus aureus), potentially putting people at risk. Laura Garcia Alvarez, then at the University of Cambridge, and colleagues were studying infections in British cows when they discovered antibiotic-resistant bacteria that they thought were MRSA. However, tests failed to identify the samples as any known strains of the superbug. Sequencing the mystery bacteria's genomes revealed a previously unknown strain of MRSA with a different version of a gene called MecA. The new strain was also identified in samples of human MRSA, and is now known to account for about 1 per cent of human MRSA cases.

"So far the treatment, known as faecal transplant, has been tested only on a drug resistant form of the bowel disease caused by the bacterium clostridium difficile. Antibiotics are unreliable against the superbug, but the transplant is 95% successful, saving patients from constant stomach cramps and chronic diarrhoea. "It sounds radical but it makes a lot of sense," said Seppelt on Thursday at a gathering of more than 4,000 Australasian anaesthetists and surgeons. "Usually patients are sufficiently miserable to go ahead, often using a donation from a relative." Healthy humans have about 100 times more bacteria cells in their gut than their own cells."

"Aker University Hospital is a dingy place to heal. The floors are streaked and scratched. A light layer of dust coats the blood pressure monitors. A faint stench of urine and bleach wafts from a pile of soiled bedsheets dropped in a corner."