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Appl. Environ. Microbiol., Jul 1995, 2624-2630, Vol 61, No. 7
JD Oliver, F Hite, D McDougald, NL Andon and LM Simpson
Using plate counts, total cell counts, and direct viable counts, we
examined the fate of cells of Vibrio vulnificus placed into natural
estuarine waters during both winter and summer months. Cells inoculated
into membrane diffusion chambers and placed into estuarine waters entered
into a viable but nonculturable (VBNC) state in January and February, when
the water temperatures were low (average, < 15 degrees C). In contrast,
when cells in the VBNC state were placed into the same waters in the warmer
months of August through November (average water temperature of ca. 21
degrees C), the cells appeared to undergo a rapid (typically, within 24 h)
resuscitation to the fully culturable state. These results were independent
of whether the cells were in the logarithmic or stationary phase and
whether they were encapsulated or not. This study indicates that the
inability to isolate V. vulnificus from cold estuarine sites may be
accounted for by entrance of the cells into a VBNC state and that recovery
from this state in natural environments may result from a temperature
upshift.
Copyright © 1995, American Society for Microbiology
Entry into, and resuscitation from, the viable but nonculturable state by Vibrio vulnificus in an estuarine environment
Department of Biology, University of North Carolina at Charlotte 28223, USA.
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