|
|
Chapter 17: Salmonella
Updated: 07/18/07
Salmonella
is a rod-shaped, motile bacterium -nonmotile exceptions S. gallinarum
and S. pullorum-, nonsporeforming and Gram-negative. There is a
widespread occurrence in animals, especially in poultry and swine.
Environmental sources of the organism include water, soil, insects, factory
surfaces, kitchen surfaces, animal feces, raw meats, raw poultry, and raw
seafoods, to name only a few.
S.typhi
and the paratyphoid bacteria normally cause septicemia and produce typhoid
or typhoid-like fever in humans. Other forms of salmonellosis generally
produce milder symptoms.
Acute symptoms include nausea, vomiting,
abdominal cramps, diarrhea, fever, and headache. Chronic consequences include
arthritic symptoms that may follow 3 - 4 weeks after onset of acute symptoms.
Onset of the illness is usually 6 - 48 h. The infective dose is as few as 15–20
cells; depends upon age and health of host, and strain differences among the
members of the genus. Acute symptoms may last for 1 to 2 d or may be prolonged,
again depending on host factors, ingested dose, and strain characteristics.
The disease is caused by penetration and passage
of Salmonella organisms from gut lumen into epithelium of small intestine
where inflammation occurs; there is evidence that an enterotoxin may be
produced, perhaps within the enterocyte. Foods commonly associated with the
disease include raw meats, poultry, eggs, milk and dairy products, fish, shrimp,
frog legs, yeast, coconut, sauces and salad dressing, cake mixes, cream-filled
desserts and toppings, dried gelatin, peanut butter, cocoa, and chocolate.
Various Salmonella species have long been
isolated from the outside of egg shells. The present situation with S.
enteritidis is complicated by the presence of the organism inside the egg,
in the yolk. This and other information strongly suggest vertical transmission,
i.e., deposition of the organism in the yolk by an infected layer hen prior to
shell deposition. Foods other than eggs have also caused outbreaks of S.
enteritidis disease (FDA, 1998).
Hazards from Salmonella can be prevented by:
heating seafood sufficiently to kill the bacteria (e.g., 24 s at 165ºF),
holding chilled seafood below 4.4ºC (40ºF), preventing post-cooking
cross-contamination and prohibiting people who are ill or are carriers of
Salmonella from working in food operations. (Ward et al., 1997).
| ICMSF recommended microbial
limits |
Contents |
Recommended microbiological limits for
Salmonella in fish (ICMSF, 1986).
|
Product |
n1 |
c2 |
Bacteria/gram or
cm2 |
|
m3 |
M4 |
|
Fresh and frozen fish and
cold-smoked fish |
5 |
0 |
0 |
- |
|
Frozen raw crustaceans |
5 |
0 |
0 |
- |
|
Frozen cooked crustaceans |
10 |
0 |
0 |
- |
|
Fresh and frozen bivalve molluscs |
20 |
0 |
0 |
- |
1Number of representative sample
units.
2 Maximum number of acceptable sample units with bacterial counts
between m and M.
3 Maximum recommended bacterial counts for good quality products.
4 Maximum recommended bacterial counts for marginally acceptable
quality products.
Plate counts below "m" are
considered good quality. Plate counts between "m" and "M" are considered
marginally acceptable quality, but can be accepted if the number of samples does
not exceed "c." Plate counts at or above "M" are considered unacceptable quality
(ICMSF, 1986).
Table A-5. FDA guideline for
Salmonella in fish.
State Guidelines for Salmonella in
seafood.
|
State |
Products |
Maximum
Salmonella
|
|
Alabama |
- |
- |
|
Alaska |
- |
- |
|
Arizona |
- |
- |
|
Arkansas |
- |
- |
|
California |
- |
- |
|
Colorado |
- |
- |
|
Connecticut |
- |
- |
|
Delaware |
- |
- |
|
Florida |
- |
- |
|
Georgia |
- |
- |
|
Hawaii |
- |
- |
|
Idaho |
- |
- |
|
Illinois |
- |
- |
|
Indiana |
- |
- |
|
Iowa |
- |
- |
|
Kansas |
- |
- |
|
Kentucky |
- |
- |
|
Louisiana |
- |
- |
|
Maine |
- |
- |
|
Maryland |
- |
- |
|
Massachusetts |
- |
- |
|
Michigan |
- |
- |
|
Minnesota |
- |
- |
|
Mississippi |
Oysters, clams, and
mussels - fresh and frozen |
0 |
|
Missouri |
- |
- |
|
Montana |
- |
- |
|
Nebraska
|
Oysters, clams, mussels, fresh or
frozen |
0 |
|
Deli foods (shrimp salad, etc.) |
0 |
|
Nevada |
- |
- |
|
New Hampshire |
- |
- |
|
New Jersey |
"Potentially hazardous" (tuna,
shrimp salad) |
0 |
|
New Mexico |
- |
- |
|
New York |
- |
- |
|
North Carolina |
- |
- |
|
North Dakota |
- |
- |
|
Ohio |
- |
- |
|
Oklahoma |
- |
- |
|
Oregon |
- |
- |
|
Pennsylvania |
- |
- |
|
Rhode Island |
- |
- |
|
South Carolina |
- |
- |
|
South Dakota |
- |
- |
|
Tennessee |
- |
- |
|
Texas |
- |
- |
|
Utah |
- |
- |
|
Vermont |
- |
- |
|
Virginia |
- |
- |
|
Washington |
- |
- |
|
West Virginia |
- |
- |
|
Wisconsin |
- |
- |
|
Wyoming |
- |
- |
(NFI, 1998)
Table A-1.
Limiting conditions for pathogen growth.
Heat resistance of Salmonella.
|
Temp. |
D-Value |
Medium |
Reference |
|
(ºC) |
(ºF) |
(min.) |
|
|
|
57.2 |
135 |
95 |
Sucrose soln. |
Goepfert et al., 1970 |
|
60 |
140 |
7.5 |
0.5% NaCl |
Thomas et al., 1966 |
|
60 |
140 |
10.0 |
Pea soup |
Thomas et al., 1966 |
|
60 |
140 |
1.5 |
Egg, pH 8.0 |
Anellis et al., 1954 |
|
60 |
140 |
9.5 |
Egg, pH 5.5 |
Anellis et al., 1954 |
|
65.5 |
150 |
1.2 |
Skim milk |
Thomas et al., 1966 |
- Motile and non-motile Salmonella in
foods: Polyclonal enzyme immunoassay screening method (AOAC, 1995b).
- Motile Salmonella in all foods:
Immunodiffusion (1-2 Test) method (AOAC, 1995c).
- Salmonella, Escherichia coli, and
other Enterobacteriaceae in foods: Biochemical system identification (Vitek GNI)
screening method (AOAC, 1995d).
- Salmonella in cocoa and chocolate:
Motility enrichment on modified semi-solid Rappaport-Vassiliadis (MSRV) medium
(AOAC, 1995e).
- Salmonella in dried milk products:
Motility enrichment on modified semi-solid Rappaport-Vassiliadis (MSRV) medium
(AOAC, 1995f).
- Salmonella in dry foods: Refrigerated
preenrichment and selective enrichment broth culture methods (AOAC, 1995g).
- Salmonella in foods: Automated
conductance method (AOAC, 1995h).
- Salmonella in foods: Colorimetric
deoxyribonucleic acid hybridization method (GENE-TRAK) (AOAC, 1995i).
- Salmonella in foods: Colorimetric
monoclonal EIA (Salmonella-Tek) screening method (AOAC, 1995j).
- Salmonella in foods: Colorimetric
monoclonal enzyme immunoassay (Salmonella Tek) (AOAC, 1995k).
- Salmonella in foods: Colorimetric
polyclonal enzyme immunoassay screening method (AOAC, 1995l).
- Salmonella in foods: Detection (AOAC,
1995m).
- Salmonella in foods: DNA hybridization
screening method (AOAC, 1995n).
- Salmonella in foods: Fluorescent
antibody (FA) screening method (AOAC, 1995o).
- Salmonella in foods: Fluorogenic and
colorimetric monoclonal enzyme immunoassay (Q-Trol) screening methods (AOAC,
1995p).
- Salmonella in foods: Hydrophobic grid
membrane filter (iso-grid) screening method (AOAC, 1995q).
- Salmonella in foods: Identification
(AOAC, 1995r).
- Salmonella in foods: Preparation of
culture media and reagents (AOAC, 1995s).
- Salmonella in foods: Serological tests
(AOAC, 1995t).
- Salmonella in low-moisture foods (AOAC,
1995u).
- Salmonella in raw, highly contaminated
foods and animal feeds, detection (AOAC, 1995v).
- Salmonella spp., Escherichia coli,
and other enterobacteriaceae in foods: Biochemical identification kit method
(AOAC, 1995w).
- Salmonella spp. in foods: Biochemical
identification kit method (AOAC, 1995x).
Commercial test products for Salmonella.
|
Test Kit |
Analytical
Technique |
Approx. Total
Test Time1 |
Supplier |
|
1-2 Test2 |
Immunodiffusion |
36 h |
BioControl Systems, Inc.
Contact: Robin Forgey
12822 SE 32nd St.
Bellevue, WA 98005
Phone: 800/245-0113; 425/603-1123
E-mail:
info@rapidmethods.com
Web:
www.rapidmethods.com |
|
Assurance Gold Salmonella EIA |
Enzyme immunoassay |
29.5 h |
BioControl Systems, Inc.
Contact: Robin Forgey
12822 SE 32nd St.
Bellevue, WA 98005
Phone: 800/245-0113; 425/603-1123
E-mail:
info@rapidmethods.com
Web:
www.rapidmethods.com |
|
Assurance Salmonella EIA2 |
Enzyme immunoassay |
48 h |
BioControl Systems, Inc.
Contact: Robin Forgey
12822 SE 32nd St.
Bellevue, WA 98005
Phone: 800/245-0113; 425/603-1123
E-mail:
info@rapidmethods.com
Web:
www.rapidmethods.com |
|
BAX® for
Screening/Salmonella2 |
Polymerase chain reaction |
26-30 h |
Qualicon, Inc.
P.O. Box 80357
Wilmington, DE 19880-0357
Phone: 800/863-6842; 302/695-9400
E-mail:
info@qualicon.com
Web: www.qualicon.com |
|
Bind® Salmonella2 |
Bacteriophage with gene for ice
crystal proteins and indicator dye |
22 h |
IDEXX Laboratories, Inc.
Contact: Greg Getchell
One Idexx Dr.
Westbrook, ME 04092
Phone: 800/321-0207; 207/856-0580
E-mail:
greg-getchell@idexx.com
Web:
www.idexx.com/fed/home/start.asp |
|
Bioline Salmonella OPTIMA for qualitative detection of
Salmonella spp |
ELISA |
42 h |
Bioline ApS
Fredericiavej 414
DK-7080 Børkop
Denmark
Phone: +45 76 62 07 09
Fax: +45 76 62 07 05
E-mail: info@bioline.dk
Web: www.bioline.dk |
|
Bioline Salmonella SELECTA for qualitative detection of
Salmonella spp |
ELISA |
26 h |
Bioline ApS
Fredericiavej 414
DK-7080 Børkop
Denmark
Phone: +45 76 62 07 09
Fax: +45 76 62 07 05
E-mail: info@bioline.dk
Web: www.bioline.dk |
|
CHECK 3 Salmonella |
Chemical, visual detection |
4-18 h |
Contamination Sciences LLC
Contact: Robert Steinhauser
4230 East Towne Blvd., Suite 191
Madison, WI 53704
Phone: 608/825-6125
E-mail:
bsteinha@contam-sci.com
Web:
www.contam-sci.com |
|
CheckPoint Colony Lift Immunoassay
Kit for Presumptive Detection of Group D Salmonella |
Colony lift immunoassay |
15-18 h |
Kirkegaard & Perry Laboratories,
Inc.
Contact: Diagnostic Technical Services
2 Cessna Court
Gaithersburg, MD 20879-4174
Phone: 800/638-3167; 301/948-7755
E-mail:
diagnostics@kpl.com
Web: www.kpl.com |
Chromogenic Salmonella
[A differentiation test for Salmonella spp. including S. typhi] |
|
72 h |
Biomedix
Contact: Claver Bundac
1105 #F North Golden Springs Dr.
Diamond Bar, CA 91765
Phone: 800/674-8648 #4282; 909/396-0244
E-mail: cb4biomedx@aol.com |
|
Dynabeads®
anti-Salmonella2 |
Immunomagnetic separation |
48 or 72 h |
Dynal Inc.
Contact: Technical Service
5 Delaware Dr.
Lake Success, NY 1042
Phone: 516/326-3270
E-mail:
techserv@dynalusa.attmail.com
Web: www.dynal.no |
|
EIAFoss Salmonella2 |
Combination ELISA and
immunomagnetic separation |
22-24 h |
Foss North America, Inc.
7682 Executive Dr.
Eden Prairie, MN 55344
Phone: 612/974-9892
E-mail:
sales@fossnorthamerica.com
Web:
www.fossnorthamerica.com |
|
GENE-TRAK Salmonella Assay2 |
Nucleic acid hybridization |
48 h |
Neogen Corporation
620 Lesher Pl.
Lansing, MI 48912
Phone: 517/372-9200
E-mail: NeogenCorp@aol.com
Web:
www.neogen.com/genetrakback.htm |
|
ISO-GRID Method for Salmonella
Detection using EF-18 Agar2 |
Enrichment followed by membrane
filtration with selective and differential culture medium based on lysine
decarboxylase and sucrose fermentation |
42-72 h (42-48 h for
negative screen and 24 h additional to confirm presumptive positive result) |
Neogen Corporation
620 Lesher Pl.
Lansing, MI 48912
Phone: 517/372-9200
E-mail: NeogenCorp@aol.com
Web:
www.neogen.com/isogridgen.htm |
|
Oxoid Salmonella Latex Test2 |
Polyvalent latex agglutination |
42 h |
Oxoid, Inc.
Contact: Jim Bell
217 Colonnade Rd.
Nepean, Ontario K2E 7K3
Canada
Phone: 613/226-1318
E-mail:
jbell@oxoid.ca |
|
Oxoid Salmonella Rapid Test2 |
Rapid differential culture with
serological confirmation |
42 h |
Oxoid, Inc.
Contact: Jim Bell
217 Colonnade Rd.
Nepean, Ontario K2E 7K3
Canada
Phone: 613/226-1318
E-mail:
jbell@oxoid.ca |
|
PATH-STICK One Step Rapid
Salmonella Test |
Immunochromatography |
38 to 56 h |
Celsis, Inc.
Contact: Susan Moffa
165 Fieldcrest Ave.
Edison, NJ 08837
Phone: 800/222-8260; 732-346-5100
E-mail:
smoffa@celsis.com
Web: www.celsis.com |
|
Probelia PCR System |
Polymerase chain reaction |
22 h |
BioControl Systems, Inc.
Contact: Robin Forgey
12822 SE 32nd St.
Bellevue, WA 98005
Phone: 800/245-0113; 425/603-1123
E-mail:
info@rapidmethods.com
Web:
www.rapidmethods.com |
|
Reveal® Microbial
Screening Test for Salmonella2 |
Sandwich ELISA |
21 h |
Neogen Corporation
620 Lesher Pl.
Lansing, MI 48912
Phone: 517/372-9200
E-mail:
NeogenCorp@aol.com
Web: www.neogen.com |
|
Salmonella2 |
Culture |
48 h |
Contamination Sciences LLC
Contact: Robert Steinhauser
4230 East Towne Blvd., Suite 191
Madison, WI 53704
Phone: 608/825-6125
E-mail:
bsteinha@contam-sci.com
Web:
www.contam-sci.com |
|
GENE-TRAK Salmonella DLP2 |
Nucleic acid hybridization |
48 h |
Neogen Corporation
620 Lesher Pl.
Lansing, MI 48912
Phone: 517/372-9200
E-mail:
NeogenCorp@aol.com
Web:
www.neogen.com/genetrakback.htm |
|
Salmonella Screen/Salmonella Verify2 |
Immunomagnetic separation
latex agglutination (for positive samples only) |
24 h |
Vicam, L.P.
Contact: Brian Kraus
313 Pleasant St.
Watertown, MA 02472
Phone: 800/338-4381
E-mail:
vicam@vicam.com
Web: www.vicam.com |
|
Salmonella Screen/SE Verify2 |
Immunomagnetic separation
latex agglutination (for positive samples only) |
24 h |
Vicam, L.P.
Contact: Brian Kraus
313 Pleasant St.
Watertown, MA 02472
Phone: 800/338-4381
E-mail:
vicam@vicam.com
Web: www.vicam.com |
|
Salmonella-TekTM 24-Hour
Method2 |
Bead immunocapture |
24 h |
Organon Teknika Corp.
100 Akzo Ave.
Durham, NC 27712
Phone: 800/654-0331; 919/620-2000
E-mail:
casey@orgtek.com |
|
Salmonella-TekTM 48-Hour
Method2 |
ELISA |
48 h |
Organon Teknika Corp.
100 Akzo Ave.
Durham, NC 27712
Phone: 800/654-0331; 919/620-2000
E-mail:
casey@orgtek.com |
|
TECRA Salmonella Immunocapture |
Immunocapture prior to using TECRA
SALM VIA |
24 h |
International BioProducts
Contact: Mike Yeager
14780 NE 95th St.
Redmond, WA 98052
Phone: 800/729-7611; 425/883-1349
E-mail:
myeager@intlbioproducts.com
Web:
intlbioproducts.com |
|
TECRA Salmonella Unique 2 |
Immunoenrichment/
ELISA
|
22 h |
International BioProducts
Contact: Bob Ward
14780 NE 95th St.
Redmond, WA 98052
Phone: 800/729-7611; 425/883-1349
E-mail:
myeager@intlbioproducts.com
Web:
intlbioproducts.com |
|
TECRA Salmonella Visual Immunoassay2 |
ELISA |
48 h |
International BioProducts
Contact: Bob Ward
14780 NE 95th St.
Redmond, WA 98052
Phone: 800/729-7611; 425/883-1349
E-mail:
myeager@intlbioproducts.com
Web:
intlbioproducts.com |
|
Transia Card Salmonella |
ELISA |
7 min |
Diffchamb AB
FO Petersons Gata 32
SE-421 31 Västra Frölunda, Sweden
Phone: +46 -31-742 33 50
E-mail: market.dept@diffchamb.se
Web: www.diffchamb.se |
|
Transia Plate Salmonella |
ELISA |
36 h |
Diffchamb AB
FO Petersons Gata 32
SE-421 31 Västra Frölunda, Sweden
Phone: +46 -31-742 33 50
E-mail: market.dept@diffchamb.se
Web: www.diffchamb.se |
|
Transia Plate Salmonella Gold |
ELISA |
36 h |
Diffchamb AB
FO Petersons Gata 32
SE-421 31 Västra Frölunda, Sweden
Phone: +46 -31-742 33 50
E-mail: market.dept@diffchamb.se
Web: www.diffchamb.se |
|
Vidas ICS |
Immunoconcentration |
24 h |
bioMérieux Inc.
Contact: bioMérieux Industry
595 Anglum Rd.
Hazelwood, MO 63042
Phone: 800/638-4835; 314/731-8500
E-mail:
usa@na.biomerieux.com
Web: www.biomerieux.com |
|
Vidas SLM2 |
Enzyme linked fluorescent assay |
48 h |
bioMérieux Inc.
Contact: bioMérieux Industry
595 Anglum Rd.
Hazelwood, MO 63042
Phone: 800/638-4835; 314/731-8500
E-mail:
usa@na.biomerieux.com
Web: www.biomerieux.com |
|
VIP for Salmonella
[Detects Salmonella spp.]
|
Lateral flow immunoassay |
28 h |
BioControl Systems, Inc.
Contact: Robin Forgey
12822 SE 32nd St.
Bellevue, WA 98005
Phone: 800/245-0113; 425/603-1123
E-mail:
info@rapidmethods.com
Web:
www.rapidmethods.com |
1Includes enrichment
2AOAC Approved
Andrews, W.H., Hammack, T.S., and Amaguana, R.M.
1998. Salmonella. . In Food and Drug Administration Bacteriological
Analytical Manual, 8th ed. (revision A), (CD-ROM version). R.L. Merker
(Ed.). AOAC International, Gaithersburg, MD.
Andrews, W.H., and June, G.A. 1998. Food
sampling and preparation of sample homogenate, Ch. 1. In Food and Drug
Administration Bacteriological Analytical Manual, 8th ed. (revision A),
(CD-ROM version). R.L. Merker (Ed.). AOAC International, Gaithersburg, MD.
Anellis, A., Lubas, J., and Rayman, M.M. 1954.
Heat resistance in liquid eggs of some strains of the genus Salmonella.
In Food Research, Volume 19, January-December, 1954. p. 377-395. The
Garrard Press, Champaign, Illinois.
AOAC. 1995a. Official Methods of Analysis,
16th ed., P.A. Cunniff (Ed.), Secs. 967.25-967.28, 978.29, 989.12, 991.13, and
994.04. AOAC International, Arlington, VA.
AOAC. 1995b. Motile and non-motile Salmonella
in foods: Polyclonal enzyme immunoassay method. Sec. 17.9.14, Method 992.11. In
Official Methods of Analysis of AOAC International, 16th ed., P.A. Cunniff
(Ed.), p. 80-81. AOAC International, Gaithersburg, MD.
AOAC. 1995c. Motile Salmonella in all
foods: Immunodiffusion (1-2 test) method. Sec. 17.9.18, Method 989.13. In
Official Methods of Analysis of AOAC International, 16th ed., P.A. Cunniff
(Ed.), p. 90-91. AOAC International, Gaithersburg, MD.
AOAC. 1995d. Salmonella, Escherichia
coli, and other enterobacteriaceae in foods: Biochemical system
identification (Vitek GNI) screening method. Sec. 17.9.06, Method 991.13. In
Official Methods of Analysis of AOAC International, 16th ed., P.A. Cunniff
(Ed.), p. 64-66. AOAC International, Gaithersburg, MD.
AOAC. 1995e. Salmonella in cocoa and
chocolate: Motility enrichment on modified semi-solid Rappaport-Vassiliadis
(MSRV) medium. Sec. 17.9.19, Method 993.13. In Official Methods of Analysis
of AOAC International, 16th ed., P.A. Cunniff (Ed.), p. 91-92. AOAC
International, Gaithersburg, MD.
AOAC. 1995f. Salmonella in dried milk
products: Motility enrichment on modified semi-solid Rappaport-Vassiliadis
(MSRV) Medium. Sec. 33.5.13, Method 995.07. In Official Methods of Analysis
of AOAC International, 16th ed., P.A. Cunniff (Ed.). AOAC International,
Gaithersburg, MD.
AOAC. 1995g. Salmonella in dry foods:
Refrigerated preenrichment and selective enrichment broth culture methods. Sec.
17.9.21, Method 994.04. In Official Methods of Analysis of AOAC International,
16th ed., P.A. Cunniff (Ed.), p. 94-94A. AOAC International, Gaithersburg, MD.
AOAC. 1995h. Salmonella in foods:
Automated conductance method. Sec. 17.9.20, Method 991.38. In Official
Methods of Analysis of AOAC International, 16th ed., P.A. Cunniff (Ed.), p.
92-94. AOAC International, Gaithersburg, MD.
AOAC. 1995i. Salmonella in foods:
Colorimetric deoxyribonucleic acid hybridization method (GENE-TRAK). Sec.
17.9.17, Method 990.13. In Official Methods of Analysis of AOAC International,
16th ed., P.A. Cunniff (Ed.), p. 87-89. AOAC International, Gaithersburg, MD.
AOAC. 1995j. Salmonella in foods:
Colorimetric monoclonal EIA (Salmonella-tek) screening method. Sec.
17.9.10, Method 986.35. In Official Methods of Analysis of AOAC International,
16th ed., P.A. Cunniff (Ed.), p. 71-74. AOAC International, Gaithersburg, MD.
AOAC. 1995k. Salmonella in foods:
Colorimetric monoclonal enzyme immunoassay (Salmonella Tek). Sec.
17.9.12, Method 993.08. In Official Methods of Analysis of AOAC International,
16th ed., P.A. Cunniff (Ed.), p. 75-77. AOAC International, Gaithersburg, MD.
AOAC. 1995l. Salmonella in foods:
Colorimetric polyclonal enzyme immunoassay screening method. Sec. 17.9.13,
Method 989.14. In Official Methods of Analysis of AOAC International, 16th
ed., P.A. Cunniff (Ed.), p. 77-80. AOAC International, Gaithersburg, MD.
AOAC. 1995m. Salmonella in foods:
Detection. Sec. 17.9.02, Method 967.26. In Official Methods of Analysis of
AOAC International, 16th ed., P.A. Cunniff (Ed.), p. 58-59. AOAC
International, Gaithersburg, MD.
AOAC. 1995n. Salmonella in foods: DNA
hybridization screening method. Sec. 17.9.16, Method 987.10. In Official
Methods of Analysis of AOAC International, 16th ed., P.A. Cunniff (Ed.), p.
84-86. AOAC International, Gaithersburg, MD.
AOAC. 1995o. Salmonella in foods:
Fluorescent antibody (FA) screening method. Sec. 17.9.08, Method 975.54. In
Official Methods of Analysis of AOAC International, 16th ed., P.A. Cunniff
(Ed.), p. 67-69. AOAC International, Gaithersburg, MD.
AOAC. 1995p. Salmonella in foods:
Fluorogenic and colorimetric monoclonal enzyme immunoassay (Q-Trol) screening
methods. Sec. 17.9.15, Method 989.15. In Official Methods of Analysis of AOAC
International, 16th ed., P.A. Cunniff (Ed.), p. 81-84. AOAC International,
Gaithersburg, MD.
AOAC. 1995q. Salmonella in foods:
Hydrophobic grid membrane filter (Iso-grid) screening method. Sec. 17.9.09,
Method 991.12. In Official Methods of Analysis of AOAC International,
16th ed., P.A. Cunniff (Ed.), p. 69-71. AOAC International, Gaithersburg, MD.
AOAC. 1995r. Salmonella in foods:
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