Safe Pork 1997This publication contains the Proceedings of the Second International Symposium on Epidemiology and Control of Salmonella in Pork, held in Copenhagen from 20-22nd of August 1997. It is our hope that the proceedings will reflect the considerable progress that has occurred in surveillance and control methods for reduction of the salmonella risk for consumers of pork products. The first meeting in this hopefully long running series of international symposia was held at the National Animal Disease Center in Ames, Iowa in March 1996.

Schedule

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1997
Wednesday, January 1st
12:00 AM

An outbreak of salmonellosis in Denmark caused by pork from a single slaughterhouse

T. Hald, Technical University of Denmark
K. Mølbak, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark
J. Niemann, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Antibiotic resistance and salmonella infection in pigs in Great Britain

C. Wray, United Kingdom Department for Environment, Food and Rural Affairs
R. H. Davies, United Kingdom Department for Environment, Food and Rural Affairs
Y. Jones, United Kingdom Department for Environment, Food and Rural Affairs
S. Chappell, United Kingdom Department for Environment, Food and Rural Affairs

Copenhagen, Denmark

12:00 AM

Antibiotic resistance in S. enterica isolated from Danish pig herds

D. L. Baggesen, Technical University of Denmark
F. M. Aarestrup, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Antimicrobial susceptibility of salmonella isolates from swine

H. L. Holcomb, Iowa State University
Paula J. Fedorka-Cray, United States Department of Agriculture
E. J. Bush, United States Department of Agriculture
D. A. Dargatz, United States Department of Agriculture
L. K. Tollefson, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Avidity measurements and anti-LPS antibodies induced during salmonella infections in pigs

C. Wiuff, Technical University of Denmark
P. Heegaard, Technical University of Denmark
P. Lind, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Bacteriological and serological characterisation of slaughter pigs from 25 serologically identified "salmonella high risk" herds

A. Wingstrand, Federation of Danish Pig Producers and Slaughterhouses
D. L. Baggesen, Technical University of Denmark
L. K. Thomsen, Technical University of Denmark
Bent Nielsen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Blood sampling at two slaughterhouses and serological screening of salmonella infections in swine using an indirect ELISA

P. J. van der Wolf, Animal Health Service, Netherlands
W. B. Wolbers, Animal Health Service, Netherlands
A. R. W. Elbers, Animal Health Service, Netherlands
H. M. J. F. Heijden, Animal Health Service, Netherlands
F. W. van Schie, Animal Health Service, Netherlands
W. A. Hunneman, Animal Health Service, Netherlands
M. J. M. Tielen, Animal Health Service, Netherlands

Copenhagen, Denmark

12:00 AM

Co-infection with S. choleraesuis and porcine reproductive and respiratory syndrom (PRRS) virus

Paula J. Fedorka-Cray, United States Department of Agriculture
R. W. Wills, United States Department of Agriculture
T. J. Stabel, United States Department of Agriculture
K.-J. Yoon, United States Department of Agriculture
J. T. Gray, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Control of salmonella in liquid feeding systems

Inge Dorthe Hansen, Biotechnological Institute

Copenhagen, Denmark

12:00 AM

Control of salmonella in pig feed

P. E. Häggblom, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Control of Salmonella in pig herds: improved housing and management

B. K. Pedersen, Federation of Danish Pig producers and Slaughterhouses

Copenhagen, Denmark

12:00 AM

Control of salmonella in swine by use of probiotics

A. Letellier, Unviersity of Montreal
S. Messier, University of Montreal
S. Quessy, Health Canada

Copenhagen, Denmark

12:00 AM

Correlation of salmonella spp. In pigs at slaugther as determined by bacterial culture and salmonella ELISA

K. B. Burkhart, NOBL Laboratories, Inc.
A. Oppedahl, NOBL Laboratories, Inc.
M. Roof, NOBL Laboratories, Inc.
J. Kolb, NOBL Laboratories, Inc.
Bent Nielsen, Danske Slagterier

Copenhagen, Denmark

12:00 AM

Cultural and serological analysis of the salmonella status of Australian pig production

P. R. Widders, Victorian Institute of Animal Science
K. J. Coates, Victorian Institute of Animal Science
J. L. Bobbitt, Victorian Institute of Animal Science
V. Kolega, Veterinary Pathology Service
A. M. Pointon, South Australian Research and Development Institute

Copenhagen, Denmark

12:00 AM

Detection of S. enterica in different materials from the environment of pig herds

D. L. Baggesen, Technical University of Denmark
J. Dahl, Federation of Danish Pig Producers and Slaughterhouses
A. Wingstrand, Federation of Danish Pig Producers and Slaughterhouses
B. Nielsen, Federation of Danish Pig Producers and Slaughterhouses

Copenhagen, Denmark

12:00 AM

Detection of S. enterica in subclinically infected herds

J. Christensen, Technical University of Denmark
M. Hillersborg, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Distribution of S. enterica serotypes and phage types in Danish pig herds

D. L. Baggesen, Technical University of Denmark
J. Christensen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Distribution of salmonella on 23 pig farms in the UK

R. H. Davies, United Kingdom Department for Environment, Food and Rural Affairs
C. Wray, United Kingdom Department for Environment, Food and Rural Affairs

Copenhagen, Denmark

12:00 AM

Dose dependent establishment of subclinical S. typhimurium infection in pigs and protection against homologous re-challenge

A. Wingstrand, Federation of Danish Pig Producers and Slaughterhouses
J. P. Nielsen, Technical University of Denmark
C. Heisel, Federation of Danish Pig Producers and Slaughterhouses
D. L. Baggesen, Technical University of Denmark
J. Dahl, Federation of Danish Pig Producers and Slaughterhouses

Copenhagen, Denmark

12:00 AM

Effect of competitive exclusion on salmonella shedding in swine

D. N. Nisbet, United States Department of Agriculture
R. C. Anderson, Milk Specialties Company
S. A. Buckley, United States Department of Agriculture
Paula J. Fedorka-Cray, United States Department of Agriculture
L. H. Stanker, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Effect of indomethacin on S. typhimurium and cholera toxin-induced fluid accumulation in pig jejunum

M. A. Unmack, Royal Veterinary and Agricultural University
M. L. Grøndahl, Royal Veterinary and Agricultural University
J. E. Olsen, Royal Veterinary and Agricultural University
E. Skadhauge, Royal Veterinary and Agricultural University
M. B. Hansen, Royal Veterinary and Agricultural University

Copenhagen, Denmark

12:00 AM

Effect of transportation stress and feed withdrawal on the shedding on S. typhimurium by swine

R. E. Isaacson, University of Illinois Urbana-Champaign
L. Firkins, University of Illinois Urbana-Champaign
F. A. Zuckermann, University of Illinois Urbana-Champaign
R. M. Weigel, University of Illinois Urbana-Champaign
J. A. Dipietro, University of Illinois Urbana-Champaign

Copenhagen, Denmark

12:00 AM

Elimination of salmonella in dry feeds

Mogens Israelsen, Biotechnological Institute
Inge Dorthe Hansen, Biotechnological Institute

Copenhagen, Denmark

12:00 AM

Epidemiologic studies of slamonella in swine using culture and ELISA

D. H. Baum, Iowa State University
D. L. Harris, Iowa State University
Bent Nielsen, Technical University of Denmark
Paula J. Fedorka-Cray, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Evaluation of sample weight for the isolation fo salmonella spp. From swine feces

Julie A. Funk, North Carolina State University
P. R. Davies, North Carolina State University
M. G. Nichols, North Carolina State University

Copenhagen, Denmark

12:00 AM

Feed as a vehiculum of salmonella in pigs

R. L. van Winsen
H. A. P. Urlings, Utrecht University
J. M. A. Snijders, Utrecht University

Copenhagen, Denmark

12:00 AM

Food safety research initiatives in the United States

G. L. Parham, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Horizontal transmission of S. choleraesuis in weaned pigs exposed to different challenge levels

L. H. Stanker, United States Department of Agriculture
R. C. Anderson, United States Department of Agriculture
S. A. Buckley, Milk Specialties Company
D. J. Nisbet, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Host defence responses in pigs experimentally infected with S. typhimurium

U. Riber, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark
Bent Nielsen, Federation of Danish Pig Producers and Slaughterhouses
P. Lind, Federation of Danish Pig Producers and Slaughterhouses

Copenhagen, Denmark

12:00 AM

Impact of in-plant HACCP implementation on food animal production in the United States

B. J. Buntain, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Influence of dietary administration of organic acids and increased feed structure on S. typhimurium infection in pigs

A. Wingstrand, Federation of Danish Pig producers and Slaughterhouses
J. Dahl, Federation of Danish Pig Producers and Slaughterhouses
L. K. Thomsen, Federation of Danish Pig Producers and Slaughterhouses
L. Jørgensen, Federation of Danish Pig Producers and Slaughterhouses
B. B. Jensen, Aarhus University

Copenhagen, Denmark

12:00 AM

Investigation of an outbreak fo human salmonellosis caused by S. enterica ssp. Enterica serovar infantis by use of pulsed field gel electrophoresis

H. C. Wegener, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Investigations on latent zoonoses in the context of the Swiss "Swein 99"- project

U. Offermann, Federal Food Safety and Veterinary Office
T. Bodmer, University of Berne
L. Audigé, Institute of Virology and Immunoprophylaxis
T. Jemmi, Federal Food Safety and Veterinary Office

Copenhagen, Denmark

12:00 AM

Looking for a reliable method to follow the salmonella status of finishing pigs

F. Humbert
K. Proux
M. Bohnert
F. Madec

Copenhagen, Denmark

12:00 AM

Mechanisms of host-agent interactions in subclinical salmonella infection in pig herds

Paula J. Fedorka-Cray, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

Modelling S. choleraesuis infection by oral route of inoculation; titration of dose strength

R. C. Anderson, Milk Specialties Company
S. A. Buckley, Milk Specialties Company
D. J. Nisbet, United States Department of Agriculture
J. R. DeLoach, United States Department of Agriculture
L. H. Stanker, United State Department of Agriculture

Copenhagen, Denmark

12:00 AM

Mucosal competitive exclusion to reduce salmonella in swine

Paula J. Fedorka-Cray, United States Department of Agriculture
J. S. Bailey, United States Department of Agriculture
N. J. Stern, United States Department of Agriculture
N. A. Cox, United States Department of Defense

Copenhagen, Denmark

12:00 AM

Pilot study on the prevalence of salmonella in slaughter pigs in Germany: I. Prevalence of salmonella in swine carcasses by cultural methods

A. Käsbohrer, Federal Office of Consumer Protection and Food Safety
L. Geue, Friedrich Loeffler Institute
F. J. Conraths, Julius Kühn-Institut
T. Blaha, Veterinary School Hannover
R. Helmuth, Federal Office of Consumer Protection and Food Safety
D. Protz, Federal Office of Consumer Protection and Food Safety

Copenhagen, Denmark

12:00 AM

Pilot study on the prevalence of salmonella in slaughter pigs in Germany: II. Prevalence of transport time and waiting periods in the abattoirs

L. Geue, Friedrich Loeffler Institute
A. Käsbohrer, Federal Office of Consumer Protection and Food Safety
R. Helmuth, Federal Office of Consumer Protection and Food Safety
T. Blaha, Veterinary School Hannover

Copenhagen, Denmark

12:00 AM

Pilot study on the prevalence of salmonella in slaughter pigs in Germany: III. Detection of salmonellae by PCR, serovar distribution and population analysis of isolates

R. Helmuth, Federal Office of Consumer Protection and Food Safety
A. Käsbohrer, Federal Office of Consumer Protection and Food Safety
L. Geue, Friedrich Loeffler Institute
W. Rabsch, Federal Office of Consumer Protection and Food Safety
D. Protz, Federal Office of Consumer Protection and Food Safety

Copenhagen, Denmark

12:00 AM

Pilot study on the prevalence of salmonella in slaughter pigs in Germany: IV. Field experiences using the Danish serological method for detection

D. Protz, Federal Office of Consumer Protection and Food Safety
C. Staak, Federal Office of Consumer Protection and Food Safety
G. Steinbach, Federal Office of Consumer Protection and Food Safety
A. Käsbohrer, Federal Office of Consumer Protection and Food Safety
R. Helmuth, Federal Office of Consumer Protection and Food Safety

Copenhagen, Denmark

12:00 AM

Pork as a source of human slamonella infection

H. C. Wegener, Technical University of Denmark
F. Bager, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Prevalence of Salmonella spp in finishing swine in Canada

A. Letellier, University of Montreal
S. Messier, Health Canada
S. Quessy, Health Canada

Copenhagen, Denmark

12:00 AM

Principles of integrated salmonella in swine production

M. Wierup, Swedish Animal Health Service, Netherlands

Copenhagen, Denmark

12:00 AM

Risk factors and control measures during slaughter and processing

B. R. Berends, Utrecht University
J. M. A. Snijders, Utrecht University

Copenhagen, Denmark

12:00 AM

Risk factors and control measures for subclinical salmonella infection in pig herds

M. J. M. Tielen
F. W. van Schie
P. J. van der Wolf
A. R. W. Elbers

Copenhagen, Denmark

12:00 AM

Risk factors associated with seroprevalence of salmonella in swine

D. H. Baum, Iowa State University
D. L. Harris, Iowa State University
Bent Nielsen, Technical University of Denmark
Paula J. Fedorka-Cray, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

S. derby infection in Swedish pig herds

H. Wahlström, National Veterinary Institute
E. Eriksson, National Veterinary Institute
A. Aspán, National Veterinary Institute
H. Lindqvist, Swedish Board of Agriculture

Copenhagen, Denmark

12:00 AM

Salmonella choleraesuis live vaccine strain suisaloral: molecular characterization and differentiation from homologous field isolates

M. Weide-Botjes, Friedrich Loeffler Institute
B. Kobe, Friedrich Loeffler Institute
S. Schwarz, Friedrich Loeffler Institute
H.-J. Selbitz, Friedrich Loeffler Institute
S. Springer, Friedrich Loeffler Institute

Copenhagen, Denmark

12:00 AM

Salmonella herd profiles established by serological testing

J. P. Nielsen, Technical University of Denmark
M. Andreasen, Federation of Danish Pig Producers and Slaughterhouses
B. Carstensen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Salmonella in Pork (SALINPORK), a new EU- project on pre-harvest and harvest control options based on epidemiologic, diagnostic and economic research

D. M. A. Lo Fo Wong, Royal Veterinary and Agricultural University
T. Hald, Royal Veterinary and Agricultural University
J. P. Nielsen, Technical University of Denmark
P. Willeberg, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Salmonella reduction at the farm level

J. Dahl, Federation of Danish Pig producers and Slaughterhouses
A. Wingstrand, Federation of Danish Pig Producers and Slaughterhouses
A. Baggesen, Technical University of Denmark
Bent Nielsen, Federation of Danish Pig producers and Slaughterhouses

Copenhagen, Denmark

12:00 AM

Salmonella serotypes in a multiple-site production system

P. R. Davies, North Carolina State University
F. T. Jones, North Carolina State University
W. E. Morgan Morrow, North Carolina State University
Julie A. Funk, North Carolina State University
F. G. Bovee, Wageningen University

Copenhagen, Denmark

12:00 AM

Strategies for elimination of S. typhimurium

J. Dahl, Federation of Danish Pig Producers and Slaughterhouses
A. Wingstrand, Federation of Danish Pig Producers and Slaughterhouses
D. L. Baggesen, Technical University of Denmark
Bent Nielsen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Subclinical salmonella infection in Danish finishing herds - association between serological and bacteriological testing

H. Stege, Technical University of Denmark
B. Carstensen, Technical University of Denmark
J. Christensen, Technical University of Denmark
N. C. Feld, Royal Veterinary and Agricultural University
D. L. Baggesen, Technical University of Denmark
J. P. Nielsen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Subclinical salmonella infection in Danish finishing herds - prevalence of S. enterica measured by bacteriological and serological examination

H. Stege, Technical University of Denmark
J. Christensen, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark
N. C. Feld, Technical University of Denmark
J. P. Nielsen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Subclinical salmonella infection in Danish finishing pig herds - risk factors

H. Stege, Technical University of Denmark
J. Dahl, Federation of Danish Pig Producers and Slaughterhouses
J. Christensen, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark
J. P. Nielsen, Technical University of Denmark
P. Willeberg, Royal Veterinary and Agricultural University

Copenhagen, Denmark

12:00 AM

Subclinical salmonella infection in Danish finishing pig herds - the effect of salmonella contaminated feed

H. Stege, Technical University of Denmark
J. Christensen, Technical University of Denmark
D. L. Baggesen, Technical University of Denmark
J. P. Nielsen, Royal Veterinary and Agricultural University

Copenhagen, Denmark

12:00 AM

The association between herd characteristics and salmonella prevalence in slaughter age pigs

P. B. Bahnson, University of Illinois Urbana-Champaign
Paula J. Fedorka-Cray, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

The Danish control programme for salmonella in slaughter pig herds

C. Halgaard, Technical University of Denmark
A. C. Nielsen, Technical University of Denmark
J. C. Ajufo, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

The Danish surveillance of salmonella in pork

L. Lund Sørensen, Federation of Danish Pig Producers and Slaughterhouses
H.-D. Emborg, Federation of Danish Pig Producers and Slaughterhouses
T. Hald, Technical University of Denmark
Bent Nielsen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

The Early Colonization pattern of S. typhimurium in pigs after oral intake

Thomas Blaha, University of Minnesota
G. Solano-Aguilar, United States Department of Agriculture
C. Pijoan, United States Department of Agriculture

Copenhagen, Denmark

12:00 AM

The effect of herd size on the sero-prevalence of S. enterica in Danish swine herds

J. Christensen, Technical University of Denmark
B. Carstensen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

The importance of vertical vs. horizontal salmonella transmission concluded from a WHO-project in a poultry meat chain - lessons for swine

T. Blaha, University of Minnesota
A. Käsbohrer, Federal Office of Consumer Protection and Food Safety

Copenhagen, Denmark

12:00 AM

The influence og growth promotant antibiotics and management system on the presence and prevalence of salmonella in swine

J. N. Nielsen, Purdue University
J. A. Patterson, Purdue University
A. Sutton, Purdue University
A. Schinckel, Purdue University
B. Richert, Purdue University
P. Boccazzi, Purdue University

Copenhagen, Denmark

12:00 AM

The occurrence of S. enterica serotypes in animal feed, pigs, pork and man

D. L. Baggesen, Technical University of Denmark
L. Lund Sørensen, Federation of Danish Pig Producers and Slaughterhouses

Copenhagen, Denmark

12:00 AM

The prevalence of salmonella antibodies in pigs at slaughter and detection of S. enterica in pork

J. Christensen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

The salmonella situation in Swedish pigs and pork production

H. Wahlstöm, National Veterinary Institute
E. Tysén, National Veterinary Institute
K. Bergström, National Veterinary Institute
A. Gunnarsson, National Veterinary Institute

Copenhagen, Denmark

12:00 AM

The use of random amplified polymorphic DNA analysis as a simple tool to distinguish between salmonella isoaltes ina n epidemiologic research

M. Swanenburg, Utrecht University
H. A. P. Urlings, Utrecht University
D. A. Keuzenkamp, Utrecht University
J. M. A. Snijders, Utrecth University

Copenhagen, Denmark

12:00 AM

Tracking salmonella on the farm: a farrow to finish study

Paula J. Fedorka-Cray, United States Department of Agriculture
J. McKean, Iowa State University
G. Beran, Iowa State University

Copenhagen, Denmark

12:00 AM

Update on laboratory diagnosis of subclinical salmonella infection in pigs

Bent Nielsen, Federation of Danish Pig Producers and Slaughterhouses
D. L. Baggesen, Technical University of Denmark

Copenhagen, Denmark

12:00 AM

Use of SC54 for the reduction of salmonella in swine

D. H. Baum, Iowa State University
D. L. Harris, Iowa State University
M. B. Roof, NOBL Laboratories, Inc.
Bent Nielsen, Technical University of Denmark
J. T. Holck, NOBL Laboratories, Inc.
D. P. Polson, NOBL Laboratories, Inc.
J. Baik, Iowa State University

Copenhagen, Denmark

12:00 AM

Using molecular epidemiology in understanding an incident of S. derby infection in Swedish pig herds

A. Aspan, National Veterinary Institute
H. Wahlstöm, National Veterinary Institute
P. Häggblom, National Veterinary Institute

Copenhagen, Denmark

12:00 AM