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Community MRSA is re-emergence of 1950s pandemic, study suggests

An early type of antibiotic-resistant bacteria that caused a global epidemic of infections in the 1950s has re-emerged as one of the community-acquired MRSA 'superbugs', according to a study published in The Lancet tomorrow (Saturday 2 April 2005).

This "re-equipping and re-emergence" of a clone that caused a pandemic 40-50 years ago could mean that community acquired MRSA will spread faster and be more widespread than previously expected, warns an international team of researchers who have been studying the bacteria.

First isolated in Australia and Canada in 1953, type 80/81 penicillin-resistant Staphylococcus aureus bacteria caused skin lesions, sepsis and pneumonia in children and young adults around the world. This pandemic of both hospital and community acquired infections waned throughout the 1960s as the antibiotic meticillin was used to treat these infections.

Now researchers have shown that one of the key clones of community acquired MRSA (CA-MRSA) - infections picked up in public places which are resistant to treatment by powerful meticillin antibiotics - may have evolved from this earlier pandemic-causing strain.

The researchers have sequenced key genes from 80/81 samples isolated between 1955 and 1969 in Australia, England and the USA, and compared them with the same regions in genes from a clone of one of the most common CA MRSAs which has been found in England and Scotland.

They found that these key regions in nearly all of the 80/81 isolates were identical to the CA-MRSA clone, and also that they share the same highly-virulent toxin, called Panton-Valentine leucocidin.

They believe that their findings suggest that this particular CA MRSA clone has evolved from the earlier 80/81 type, developing resistance to meticillin antibiotics over the last 30-40 years, possibly through several intermediate steps.

"At the time of the 1950s pandemic, many doctors thought that these isolates were unusually trans
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Source:University of Bath


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