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Infection and Immunity, February 2000, p. 956-959, Vol. 68, No. 2
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Phagocytosed Bordetella pertussis Fails To Survive in Human Neutrophils

Derrick H. Lenz,dagger Christine L. Weingart, and Alison A. Weiss*

Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati, Cincinnati, Ohio 45267-0524

Received 7 October 1999/Accepted 9 November 1999

Previous studies have reported that phagocytosed Bordetella pertussis survives in human neutrophils. This issue has been reexamined. Opsonized or unopsonized bacteria expressing green fluorescent protein (GFP) were incubated with adherent human neutrophils. Phagocytosis was quantified by fluorescence microscopy, and the viability of phagocytosed bacteria was determined by colony counts following treatment with polymyxin B to kill extracellular bacteria. Only 1 to 2% of the phagocytosed bacteria remained viable. Opsonization with heat-inactivated immune serum reduced the amount of attachment and phagocytosis of the bacteria but did not alter survival rates. In contrast to previous reports, these data suggest that phagocytosed B. pertussis bacteria are killed by human neutrophils.

* Corresponding author. Mailing address: Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati, 231 Bethesda Ave., Cincinnati, OH 45267-0524. Phone: (513) 558-2820. Fax: (513) 558-8474. E-mail: alison.weiss{at}uc.edu.

dagger Present address: Biology Department, Drew University, Madison, NJ 07940.

Infection and Immunity, February 2000, p. 956-959, Vol. 68, No. 2
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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