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Intracellular growth of Legionella pneumophila serogroup 1 monoclonal antibody type 2 positive and negative bacteria

Published online by Cambridge University Press:  15 May 2009

P. H. Edelstein
Affiliation:
Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104–4283 Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104–4283
M. A. C. Edelstein
Affiliation:
Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104–4283
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Summary

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Epidemiological evidence suggests that monoclonal antibody type 2 positive (MAB 2+) Legionella pneumophila serogroup 1 (LP1) more often causes disease than do MAB 2 isolates, and there is evidence that MAB 2 LP1 grow less well in cells than do MAB 2+ bacteria. We tested the intracellular growth rates of ten randomly selected MAB 2 LP1 isolates, by using guinea-pig alveolar macrophages, and human monocyte-derived macrophages. Save a low virulence control, all ten MAB 2 isolates grew as well in cells as a virulent MAB 2+ isolate. Heterogeneity of MAB 2 LP1 growth in cells exists, making poor intracellular growth an unlikely explanation for why MAB 2+ LP1 appear to cause disease more often.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1993

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