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J. Bacteriol., 01 1996, 542-545, Vol 178, No. 2
Copyright © 1996, American Society for Microbiology

Salmonella typhimurium fimbrial phase variation and FimA expression

S Clegg, LS Hancox and KS Yeh
Department of Microbiology, University of Iowa, College of Medicine, Iowa City 52242, USA.

Bacteria in a nonfimbriate phase because of continuous aeration of liquid cultures produce FimA in amounts similar to those produced by fimbriate bacteria. However, relatively low FimA production was observed in nonfimbriate-phase cultures obtained by growth on solid media or by anaerobic incubation. Regardless of the fimbrial phase of Salmonella typhimurium, the fimA promoter region was always oriented in the direction that might allow fimA transcription.


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