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. 1995 Sep;61(9):3494–3498. doi: 10.1128/aem.61.9.3494-3498.1995

Survival and Activity of lux-Marked Aeromonas salmonicida in Seawater

Y Ferguson, L A Glover, D M McGillivray, J I Prosser
PMCID: PMC1388587  PMID: 16535133

Abstract

The fish pathogen Aeromonas salmonicida was chromosomally marked with genes encoding bacterial luciferase, luxAB, isolated from Vibrio fischeri, resulting in constitutive luciferase production. During exponential growth in liquid batch culture, luminescence was directly proportional to biomass concentration, and luminometry provided a lower detection limit of approximately 10(sup3) cells ml(sup-1), 1 order of magnitude more sensitive than enzyme-linked immunosorbent assay detection. In sterile seawater at 4(deg)C, lux-marked A. salmonicida entered a dormant, nonculturable state and population activity decreased rapidly. The activity per viable cell, however, increased by day 4, indicating that a proportion of the population remained active and culturable. Putative dormant cells were not resuscitated after the addition of a range of substrates.

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Selected References

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