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Life-saving in the bacterial world: How Campylobacter rely on Pseudomonas to infect humans
Date:10/7/2010

Many a holiday is ruined by food poisoning, frequently caused by the bacterium Campylobacter jejuni. Although Campylobacter infections are rarely life-threatening they are extremely debilitating and have been linked with the development of Guillain-Barr syndrome, one of the leading causes of non-trauma-induced paralysis worldwide.

Campylobacter jejuni is well adapted to life in the guts of animals and birds, where it is often found in very high levels. However, to infect humans it also needs to be able to survive outside the gut, on the surface of meat that will be eaten by humans. It is known that C. jejuni cannot grow under normal atmospheric conditions the levels of oxygen are too high for it so how it survives was until recently unknown. The mystery has now been solved by Friederike Hilbert and colleagues at the Institute of Meat Hygiene, Meat Technology and Food Science of the University of Veterinary Medicine, Vienna.

The surface of meat harbours a number of species of bacteria that fortunately are rarely harmful to humans, although they are associated with spoilage. It seems possible that the various species interact and Hilbert hypothesized that such interactions might help bacteria such as Campylobacter jejuni survive under hostile, oxygen-rich conditions. She thus tested the survival of C. jejuni in the presence of various meat-spoiling bacteria. When incubated alone or together with bacteria such as Proteus mirabilis or Enterococcus faecalis, Campylobacter survived atmospheric oxygen levels for no longer than 18 hours. However, when incubated together with various strains of Pseudomonas, Campylobacter were found to survive for much longer, in some cases over 48 hours, which would be easily long enough to cause infection.

There were differences in the extent of prolonged survival depending on the sources of the Campylobacter analysed but all is
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Contact: Prof. Friederike Hilbert
friederike.hilbert@vetmeduni.ac.at
University of Veterinary Medicine -- Vienna
Source:Eurekalert

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