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Appl. Environ. Microbiol., 04 1996, 1300-1305, Vol 62, No. 4
X Jiang and TJ Chai
Morphological changes of Vibrio parahaemolyticus from rods to spheres took
place after a culture was subjected to starvation at a wide range of
temperatures. Scanning electron micrographs revealed that starved spherical
cells gradually developed a rippled cell surface with blebs and an
extracellular filamentous substance adhesive to the cell surface. Cells
starved at a low temperature for certain intervals were counted by various
bacterial enumeration methods, including plate count, direct viable count,
and total cell count for both Kanagawa- positive and -negative strains. The
results indicated that this species could reach the nonculturable stage in
50 to approximately 80 days during starvation at 3.5 degrees C.
Kanagawa-negative strain 38C6 lost culturability more slowly than
Kanagawa-positive strain 38C1 at low temperature. As detected by
thiosulfate-citrate-bile salts-sucrose plate count, a high percentage of
the surviving cells at 3.5 degrees C in starvation medium were possibly
injured by the low temperature rather than by starvation. Both addition of
nalidixic acid to the starved cultures and the most-probable-number method
demonstrated that the cells recovered after a temperature upshift probably
represented the regrowth of a few surviving cells. These surviving cells
were capable of growth and multiplication with limited nutrients at an
extraordinary rate when the temperature was upshifted.
Copyright © 1996, American Society for Microbiology
Survival of Vibrio parahaemolyticus at low temperatures under starvation conditions and subsequent resuscitation of viable, nonculturable cells
Horn Point Environmental Laboratory, University of Maryland System, Cambridge 21613, USA.
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