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Microbiology 146 (2000), 1881-1889
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Microbiology (2000), 146, 1881-1889.
© 2000 Society for General Microbiology

Pathogenicity and Medical Microbiology

Survival in experimental Candida albicans infections depends on inoculum growth conditions as well as animal host

Frank C. Odds1, Luc Van Nuffel2 and Neil A. R. Gow1

Department of Molecular and Cell Biology, Institute of Medical Sciences, Foresterhill, University of Aberdeen, Aberdeen AB25 2ZD, UK1
Department of Bacteriology and Mycology, Janssen Research Foundation,B-2340 Beerse, Belgium2

Author for correspondence: Frank C. Odds. Tel: +44 1224 273128. Fax: +44 1224 273144. e-mail: f.odds{at}abdn.ac.uk

Evidence is presented that the growth medium used to prepare a Candida albicans challenge inoculum is a significant factor determining the ability of a fungus strain to gain an initial invasive hold immediately after injection into an animal host, and thus determining gross strain lethality. Three C. albicans strains, one known to be attenuated in virulence, were grown in two broth media and injected intravenously at different doses into female NMRI mice and male albino guinea pigs. For each fungus strain and challenge dose, survival was longer from inocula grown in a diluted, buffered peptone-based broth than from inocula grown in Sabouraud glucose broth. When animals were challenged intravenously with yeast doses adjusted to give the same mean survival time regardless of strain or growth medium, the progression of fungus tissue burdens (c.f.u. g-1) in kidneys, lungs, liver, spleen and brain samples was broadly similar for all three C. albicans strains but differed between the two animal hosts. The morphological form of C. albicans recovered from infected tissues differed at the level of both the fungus strain and the host tissue. Use of survival-standardized inocula provides a means of distinguishing differences in progression of experimental disseminated Candida infections that are related to the infecting strain from those related to the animal host.

Keywords: Candida albicans, experimental infection, virulence

Abbreviations: MI, morphology index




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