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Genetic differences that make some people susceptible to meningitis revealed in major new study
Date:8/8/2010

Genetic differences that make some people susceptible to developing meningococcal meningitis and septicaemia, and others naturally immune, are revealed in a new study of over 6,000 people, published today in Nature Genetics.

The research, led by Imperial College London and the Genome Institute of Singapore, is the largest ever genetic study of meningitis and septicaemia caused by meningococcal bacteria. It suggests that people who develop these diseases have innate differences in their natural defences that leave them unable to attack meningococcal bacteria successfully.

Although several different bacteria and viruses cause meningitis, meningococcal bacteria cause one of the most devastating forms of the disease - meningococcal meningitis, which is fatal in approximately one in ten cases. Meningococcal septicaemia is a type of blood poisoning that often accompanies this form of meningitis.

Meningococcal meningitis and septicaemia most commonly affect babies, young children, teenagers and young adults. The diseases are frightening because they can strike rapidly, with people becoming critically ill within hours.

There are vaccines available against some strains of meningococcal bacteria but not others. The researchers hope that their new findings will boost the development of effective vaccines to combat the group B strain of the bacteria, for which there is currently no vaccine. Every year, this strain causes thousands of deaths in children and adults across the world.

Most people carry the meningococcal bacteria in their throat intermittently during their lives without ever developing the disease. Prior to today's study, it has not been known why some people in the population develop meningococcal meningitis and septicaemia while others appear to be naturally immune to the bacteria.

Today's study compared the genetic makeup of 1,500 people who developed meningococcal meningitis, from the UK, Ho
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Contact: Laura Gallagher
l.gallagher@imperial.ac.uk
44-207-594-8432
Imperial College London
Source:Eurekalert

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