The emergence of community acquired methucillin resistant staph aureus is becoming worrisome because of the high death rate and difficulty treating.
Page last updated at 08:01 GMT, Wednesday, 20 May 2009 09:01 UK
Researchers believe the new strain of the antibiotic-resistant bacterium is becoming more widespread.
It is known as community acquired MRSA, (CA-MRSA) because, unlike most forms of the superbug, it poses a significant risk outside hospitals.
CA-MRSA pneumonia is particularly dangerous due to the rapid, aggressive nature of the infection
Professor Mark Enright
Imperial College London
The researchers, from Emory University School of Medicine in Atlanta, say death rates following infection may be higher than 50%.
They warn the emergence of swine flu could intensify the problem, as CA-MRSA appears to strike people who are already ill with flu.
http://news.bbc.co.uk/2/hi/uk_news/england/8058841.stm