1887

Abstract

Bile-tolerant spp. are emerging human and animal pathogens. However, due to their fastidious nature, which requires nutrient-rich complex media to grow, infection with these bacteria may be underestimated. The accumulation of toxic metabolites in cultures may be one of the main obstacles for successful culture of these organisms. The present study examined various potential growth-enhancing substances for spp. and, furthermore, how they may affect spiral to coccoid conversion. Five spp. were cultured on agar and in broth media supplemented with activated charcoal, β-cyclodextrin, or porcine gastric mucin. Growth was determined by estimating the numbers of colony-forming units and colony diameter, as well as bacterial cell mass. Coccoid transformation was estimated every 24 h by both Gram and acridine-orange staining. Activated charcoal was superior in supporting growth and increased cell mass on agar and in broth media. β-Cyclodextrin delayed spiral to coccoid conversion by and , whereas activated charcoal delayed the conversion to coccoid forms of and . The progression to coccoid forms by on agar media was not influenced by any growth supplement. The spiral to coccoid conversion was more rapid in broth media than on agar media. The growth enhancement observed is probably related to the capacity of activated charcoal to remove toxic compounds in culture media.

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2002-03-01
2024-03-29
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