Compact growth of Staphylococcus Haemolyticus in soft agar is not due to hydrophobic interaction between the cocci

Zs I. Godó, Erzsébet Magyar, I. Andirkó, F. Rozgonyi

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It was hypothesized that the formation of compact colony in soft-agar both in the presence and absence of serum, characteristic mainly for strains of the species Staphylococcus haemolyticus among coagulase-negative staphylococci [Szucs et al. Acta Microbiologica Hungarica 40:181-189 (1993)] was due to hydrophobic interaction between cocci. The effect of a number of surface active agents on this phenomenon was examined. Neither 0.1% and 1% Tween-80 nor 5% and 10% ethylene glycol and polyethylene glycol nor 0.1%-4% trypsin influenced the colony morphology in soft-agar prepared in modified Staphylococcus 110 broth. Bovine lactoferrin and apolactoferrin at concentrations of 0.1%-0.4% made compact colonies transient to diffuse ones. Thus, cocci are not adhered to each other in compact ball-like colonies by hydrophobic interaction or trypsin-sensitive proteins. It is possible that still unknown polysaccharide-binding proteins or other trypsin-resistant proteins are responsible for the formation of compact colonies by Staphylococcus haemolyticus in soft-agar.

Original languageEnglish
Pages (from-to)343-349
Number of pages7
JournalActa microbiologica et immunologica Hungarica
Issue number4
Publication statusPublished - Dec 1 1997


ASJC Scopus subject areas

  • Immunology and Microbiology(all)

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