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.
The potential threat is detailed in a study appearing in the journal Lancet Infectious Diseases.
However, experts stressed cases of pneumonia caused by CA-MRSA in the UK were very rare."CA-MRSA pneumonia is particularly dangerous due to the rapid, aggressive nature of the infection"