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The effect of oxygen-dependent antimicrobial systems on strains of Legionella pneumophila of different virulence

Published online by Cambridge University Press:  19 October 2009

R. I. Jepras  and
R. B. Fitzgeorge
R. I. Jepras
Affiliation:
Experimental Pathology Laboratory, Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire SP4 OJG
R. B. Fitzgeorge
Affiliation:
Experimental Pathology Laboratory, Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire SP4 OJG
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Summary

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Four strains of Legionella pneumophila of different virulence as identified by ability to produce pneumonia and death in guinea-pigs infected by a fine-particle aerosol were examined for factors which may intracellularly influence virulence. Possible bactericidal mechanisms possessed by alveolar phagocytes were examined. A relationship could be established between resistance to H2O2, catalase activity and virulence amongst the strains.

Virulent strains resisted the bactericidal activity generated by the xanthine oxidase system; avirulent strains did not. Incorporation of various specific inhibitors of the xanthine oxidase system indicated that the main bactericidal activities were associated with the production of H2O2 and hydroxyl radicals ('OH).

All strains of L. pneumophila were susceptible to the bactericidal activity generated by the myeloperoxidase-H202-halide system, confirming earlier observations that polymorphonuclear neutrophil leucocytes (PMNLS) are able to kill both virulent and avirulent strains of L. pneumophila.

Type
Research Article
Information
Journal of Hygiene , Volume 97 , Issue 1 , August 1986 , pp. 61 - 69
Copyright
Copyright © Cambridge University Press 1986

References

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