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Applied and Environmental Microbiology, March 1999, p. 1055-1060, Vol. 65, No. 3
Duke Medical Center, Duke University, Durham,
North Carolina 277151; Department of
Microbiology, Pathology, and Parasitology, College of Veterinary
Medicine, North Carolina State University, Raleigh, North Carolina
276062; and University of Arkansas,
Fayetteville, Arkansas 722033
Received 20 August 1998/Accepted 8 December 1998
To reduce human exposure to Salmonella spp. in poultry
products, broiler chicken flocks have been tested by culture methods. Since the standard techniques may take 3 to 5 days, rapid detection methods have been developed. In this study we tested the performance of
three rapid tests originally developed for food samples by using
environmental samples obtained from poultry houses. These rapid tests
were Reveal, an enzyme-linked immunosorbent assay from Neogen Corp.;
BIND, a bacterial ice nucleation detection method from Idetek Corp.;
and a filter monitor method from Future Medical Technologies, Inc. For
the standard culture, brilliant green with novabiocin and
xylose-lysine-tergitol-4 agar were used for presumptive
identification, and identities were confirmed by using poly-O antisera.
Environmental samples were collected from farms belonging to an
integrated poultry company prior to chick placement and 1 week before
slaughter. Sensitivities, specificities, and predictive values with
95% confidence intervals were calculated. Statistical differences were
determined by using McNemar's chi square test. The sensitivities of
the different tests were not stable, varying widely between sample
times, and were affected by freezing of the samples. All of the rapid
tests had low sensitivities, which led to many false-negative results.
All tests were able to detect Salmonella spp. at a
concentration of 10 CFU/ml in at least one of four trials. The BIND and
Reveal tests were simple to use with multiple samples and reduced
laboratory time by up to 1 day. Based on our results, we do not
recommend that any of these rapid tests, in their present state of
development, be utilized with environmental samples collected with drag swabs.
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Sensitivity, Specificity, and Predictive Values of Three
Salmonella Rapid Detection Kits Using Fresh and Frozen
Poultry Environmental Samples versus Those of Standard
Plating
*
Corresponding author. Mailing address: Department of
Microbiology, Pathology, and Parasitology, College of Veterinary
Medicine, North Carolina State University, 4700 Hillsborough St.,
Raleigh, NC 27606. Phone: (919) 513-6253. Fax: (919) 513-6455. E-mail: maria_correa{at}ncsu.edu.
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