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Evaluation Of Diatomaceous Earth As An Adjunct To Sheep Parasite Control In Organic Farming, Gary D. Osweiler, Thomas L. Carson Jan 1997

Evaluation Of Diatomaceous Earth As An Adjunct To Sheep Parasite Control In Organic Farming, Gary D. Osweiler, Thomas L. Carson

Leopold Center Completed Grant Reports

Diatomaceous earth (DE) has been touted as a natural and effective way to control gastrointestinal (Gl) parasites in sheep. In this study, grazing lambs were fed DE at 5 and 10 percent of a supplemental ration for periods from 66 to 117 days. Weight gains, hemoglobin, packed cell volume, fecal egg/gram counts, and abomasal Gl larval counts were not different in controls vs. DE-fed lambs, although there was a trend toward lower fecal egg/gram counts in DE-treated lambs. DE by itself was not shown to be an effective parasite control agent, but could be used as part of ...


Temporal And Morphologic Characterization Of The Distribution Of Porcine Reproductive And Respiratory Syndrome Virus (Prrsv) By In Situ Hybridization In Pigs Infected With Isolates Of Prrsv That Differ In Virulence, J. S. Haynes, P. G. Halbur, T. Sirinarumitr, P. S. Paul, X.-J. Meng, E. L. Huffman Jan 1997

Temporal And Morphologic Characterization Of The Distribution Of Porcine Reproductive And Respiratory Syndrome Virus (Prrsv) By In Situ Hybridization In Pigs Infected With Isolates Of Prrsv That Differ In Virulence, J. S. Haynes, P. G. Halbur, T. Sirinarumitr, P. S. Paul, X.-J. Meng, E. L. Huffman

Veterinary Pathology Publications and Papers

Three groups of 5-week-old cesarian-derived, colostrum-deprived pigs were inoculated intranasally with either a high-virulence isolate (VR2385) or a low-virulence isolate (VR2431) of porcine reproductive and respiratory syndrome virus (PRRSV) or with uninfected cell culture and media. Formalin-fixed, paraffin-embedded tissues from pigs euthanatized at 10, 21, and 28 days post-inoculation were examined by in situ hybridization for PRRSV nucleic acid using a digoxigenin-labeled antisense RNA probe approximately 1,000 nucleotides in length. Alveolar macrophages were positive in the lungs of 9/9, 2/2, and 0/2 VR2385-inoculated pigs and 7/9, 1/2, and 2/3 VR2431-inoculated pigs at 10 ...


Salmonella Serotypes In A Multiple-Site Production System, P. R. Davies, F. T. Jones, W. E. Morgan Morrow, Julie A. Funk, F. G. Bovee Jan 1997

Salmonella Serotypes In A Multiple-Site Production System, P. R. Davies, F. T. Jones, W. E. Morgan Morrow, Julie A. Funk, F. G. Bovee

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Long-term trends in production agriculture in the USA are towards fewer and larger producers. The number of hog operations declined from 430,000 in 1984 to 209,000 in 1994. In 1991, although 84% of operations had less than 1000 head, these accounted for only 22% of hogs produced. Increased farm size means that emergence of a foodbome pathogen on a farm can affect a greater volume of product and potentially affect more consumers (Hueston and Fedorka-Cray 1995). Alternatively, some intensive production practices allow greater control of the environment and may lead to an overall safer food supply. "Improving production ...


S. Derby Infection In Swedish Pig Herds, H. Wahlström, E. Eriksson, A. Aspán, H. Lindqvist Jan 1997

S. Derby Infection In Swedish Pig Herds, H. Wahlström, E. Eriksson, A. Aspán, H. Lindqvist

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Within the Swedish salmonella control program any findings of salmonella is compulsory notifiable. In all Salmonella infected herds an official veterinary officer will perform an investigation and supervise the clearance of Salmonella infection/contamination from the farm (Wierup, M. 1991). Infected farms are subjected to restrictions including prohibition of movement of live animals except for transport to sanitary slaughter.


Detection Of S. Enterica In Subclinically Infected Herds, J. Christensen, M. Hillersborg, D. L. Baggesen Jan 1997

Detection Of S. Enterica In Subclinically Infected Herds, J. Christensen, M. Hillersborg, D. L. Baggesen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

The nation-wide salmonella control program is based on serological monitoring of swine herds (meat juice samples taken at the slaughter line) and classification of the herds on the basis of serology (Mousing eta!. 1997). When a herd is classified as a level 2 or level 3 herd (moderate or high sera-prevalence), a follow-up program is instituted. From August 1996, the follow-up program comprises: (1) a letter to the individual herd with information about the assigned salmonella level and the follow-up program (the injunction); (2) mandatory visits by veterinary advisors including a profile of the salmonella occurrence in the herd. The ...


The Salmonella Situation In Swedish Pigs And Pork Production, H. Wahlstöm, E. Tysén, K. Bergström, A. Gunnarsson Jan 1997

The Salmonella Situation In Swedish Pigs And Pork Production, H. Wahlstöm, E. Tysén, K. Bergström, A. Gunnarsson

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

The objective of the Swedish salmonella control is to ensure that food of animal origin is free from salmonella. The strategy is to prevent infection/contamination in feed and animals. Any finding of salmonella is notifiable and action is always taken to eliminate the infection. Repeated surveys have been performed in order to control the efficacy of the salmonella control (Robertsson, 1976; Wierup et al., 1992; Wahlstrom et al., 1993; Hopp et al., 1996). Since 1995 continuos monitoring programmes aimed at documenting the prevalence of Salmonella and detecting foci of infection are in force (Anonymous, 1995).


Food Safety Research Initiatives In The United States, G. L. Parham Jan 1997

Food Safety Research Initiatives In The United States, G. L. Parham

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

The CSREES supports food safety research and education through funds appropriated under several legislative authorities. The National Research Initiative (NRI) is the major peer-reviewed competitive grants program in support of agricultural research. Within the NRI, the "Ensuring Food Safety Program" supports research to increase understanding of disease-causing microorganisms and their products, naturally occurring toxicants, and drug residues which contaminate foods. The "Food Characterization, Process, and Product Research Program" supports research to increase the quality, utility, convenience, nutrient value, and safety of food products through innovative processing methods. The "Markets and Trade Program" has a component which supports research on the ...


Salmonella Reduction At The Farm Level, J. Dahl, A. Wingstrand, A. Baggesen, Bent Nielsen Jan 1997

Salmonella Reduction At The Farm Level, J. Dahl, A. Wingstrand, A. Baggesen, Bent Nielsen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

An important part of the Danish salmonella program is surveillance of all Danish pig herds with a yearly deliverance of more than 100 slaughter pigs. Herds categorized in infection level 2 or 3 are obliged to take effort to reduce the seroprevalence of slaughter pigs to an acceptable level. It has been shown, that it is possible to remove pigs from infected herds and raise them to the normal age of slaughter without detectable salmonella infection (Dahl and others, 1996). Based on these results, a model for salmonella reduction on herd level was established. The model consisted of a microbiological ...


Control Of Salmonella In Pig Herds: Improved Housing And Management, B. K. Pedersen Jan 1997

Control Of Salmonella In Pig Herds: Improved Housing And Management, B. K. Pedersen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

In 1993 an analysis indicated that Danish pig meat had a high content of salmonella. Therefore, the Federation of Danish Pig Producers and Slaughterhouses in collaboration with the Ministry of Agriculture agreed on a strategy to control salmonella in pork. One objective of this scheme was to control and eliminate transmission of salmonella from breeding and multiplier herds to production herds.


Effect Of Competitive Exclusion On Salmonella Shedding In Swine, D. N. Nisbet, R. C. Anderson, S. A. Buckley, Paula J. Fedorka-Cray, L. H. Stanker Jan 1997

Effect Of Competitive Exclusion On Salmonella Shedding In Swine, D. N. Nisbet, R. C. Anderson, S. A. Buckley, Paula J. Fedorka-Cray, L. H. Stanker

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Despite the efforts of researchers and public health agencies, the incidence of human salmonellosis has continued to increase over the past 20 years. Salmonellosis is now the most common cause of food-borne gastroenteritis. The number of reported cases of human Salmonella infection exceeds 40,000 per year. The Communicable Disease Center estimates that the true annual incidence of human salmonellosis in the United States may be as high as 4 million cases.


The Danish Control Programme For Salmonella In Slaughter Pig Herds, C. Halgaard, A. C. Nielsen, J. C. Ajufo Jan 1997

The Danish Control Programme For Salmonella In Slaughter Pig Herds, C. Halgaard, A. C. Nielsen, J. C. Ajufo

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Outbreaks of Salmonellosis in Danish pig herds were for many years very rare. However, at the beginning of this decade Salmonellosis in pigs became an emerging problem. The number of human cases were also increasing and in 1993 an epidemic (S. infantis) occured in the Copenhagen area. The epidemic could be attributed to contaminated pork. Consequently, a preliminary Salmonella control programme was initiated in 1993 and the present control programme was established in January 1995, according to the Danish Act of Zoonoses, 1994 and Order of Salmonella Surveillance, 1994.


Effect Of Transportation Stress And Feed Withdrawal On The Shedding On S. Typhimurium By Swine, R. E. Isaacson, L. Firkins, F. A. Zuckermann, R. M. Weigel, J. A. Dipietro Jan 1997

Effect Of Transportation Stress And Feed Withdrawal On The Shedding On S. Typhimurium By Swine, R. E. Isaacson, L. Firkins, F. A. Zuckermann, R. M. Weigel, J. A. Dipietro

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Of the food borne pathogens, the United States Department of Agriculture has identified Salmonella to receive its highest priority (Davies, P., 1997). The consumption of pork products contaminated with Salmonella is a frequent cause of disease. Bryan (Bryan, 1988), for example, demonstrated, for example, that II % of Salmonella outbreaks were associated with the consumption of pork, while Bean and Griffin ( 1990) have described numerous outbreaks where pork was identified as the source of contamination. S. typhimurium is one of the leading causes of salmonellosis in man and is the second most commonly isolated serotype from swine (HargrettBean, Pavia, and Tauxe ...


Use Of Sc54 For The Reduction Of Salmonella In Swine, D. H. Baum, D. L. Harris, M. B. Roof, Bent Nielsen, J. T. Holck, D. P. Polson, J. Baik Jan 1997

Use Of Sc54 For The Reduction Of Salmonella In Swine, D. H. Baum, D. L. Harris, M. B. Roof, Bent Nielsen, J. T. Holck, D. P. Polson, J. Baik

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Infections caused by S. choleraesuis have significant economic impact on pork production in the United States (Wilcock and Schwartz 1992). An avirulent live culture vaccine has been described for the purpose of protecting pigs against infections caused by S. choleraesuis (Kramer, Roof et al. 1992) (Roof and Doitchinoff 1995). Other serotypes of Salmonella have been associated with infections in swine in the United States. These includeS. typhimurium and S. typhisuis (Wilcock and Schwartz 1992), S. heidelberg (Reed, Olander et al. 1985), and S. agona (Fernandez, Duhamel et al. 1993). Two experiments were conducted. Experiment number I was designed to determine ...


Co-Infection With S. Choleraesuis And Porcine Reproductive And Respiratory Syndrom (Prrs) Virus, Paula J. Fedorka-Cray, R. W. Wills, T. J. Stabel, K.-J. Yoon, J. T. Gray Jan 1997

Co-Infection With S. Choleraesuis And Porcine Reproductive And Respiratory Syndrom (Prrs) Virus, Paula J. Fedorka-Cray, R. W. Wills, T. J. Stabel, K.-J. Yoon, J. T. Gray

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Porcine reproductive and respiratory syndrome virus (PRRSV) and Salmonella choleraesuis (SC) are important components of the swine respiratory disease complex. Although respiratory disease is a major clinical component of PRRS in field cases, it has been difficult to produce respiratory disease in pigs in the research environment simply by exposure to PRRSV. It has been postulated that this may be due to low pig density, ideal housing conditions, and the absence of concurrent bacterial infections in the research setting. Pigs subclinically infected with SC are considered the most common source of infection to naive herds. Like PRRS, it is not ...


Control Of Salmonella In Swine By Use Of Probiotics, A. Letellier, S. Messier, S. Quessy Jan 1997

Control Of Salmonella In Swine By Use Of Probiotics, A. Letellier, S. Messier, S. Quessy

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Control of Salmonella on the farm is currently undertaken by changes in management protocols or by use of live attenuated vaccines (Roof et al., 1992; Kramer et al., 1992). Although these vaccines are efficacious in reducing morbidity and mortality associated with salmonellosis, carrier animals are still evident within the population. While the carrier state has been defined for S. typhimurium and S. choleraesuis under experimental conditions (Wood et al., 1989; Fedorka-Cray et al., 1994; Gray et al., 1995, 1996a, 1996b), little is known about the exact modes of transmission and maintenance of the disease in swine herds.


Using Molecular Epidemiology In Understanding An Incident Of S. Derby Infection In Swedish Pig Herds, A. Aspan, H. Wahlstöm, P. Häggblom Jan 1997

Using Molecular Epidemiology In Understanding An Incident Of S. Derby Infection In Swedish Pig Herds, A. Aspan, H. Wahlstöm, P. Häggblom

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

In the summer of 1996, two epidmiologically linked pig herds in the south-west of Sweden were found to be infected with Salmonella Derby. S. Derby is a serotype of Salmonella that has been reported to cause problems for pork producers in for example Sweden, Norway, Denmark, Ireland and the USA.


Evaluation Of Sample Weight For The Isolation Fo Salmonella Spp. From Swine Feces, Julie A. Funk, P. R. Davies, M. G. Nichols Jan 1997

Evaluation Of Sample Weight For The Isolation Fo Salmonella Spp. From Swine Feces, Julie A. Funk, P. R. Davies, M. G. Nichols

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

In many countries, contamination of meat and poultry products with bacteria potentially pathogenic to humans has become a major public health and trade concern. In 1996, there were significant legislative changes to the regulation of meat inspection in the U.S.A.. The new inspection procedures include mandatory microbiologic testing for 'generic' Escherichia coli and Salmonella, with specified standards for acceptable process control. As a result of these regulatory changes there has been an interest in identifying control measures at the farm level (pre-harvest) to reduce the risk of bacterial contamination of meat products.


The Occurrence Of S. Enterica Serotypes In Animal Feed, Pigs, Pork And Man, D. L. Baggesen, L. Lund Sørensen Jan 1997

The Occurrence Of S. Enterica Serotypes In Animal Feed, Pigs, Pork And Man, D. L. Baggesen, L. Lund Sørensen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

In Denmark, national surveillance systems have been established with the aim of monitoring the level of salmonella infection in animal feed, pig herds and pork. The human infections are monitored at Statens Serum Institute. All Salmonella isolates identified are serotyped according to the Kauffmann-White scheme. The results of the surveillance allow a comparison of the serotypes occurring in the different levels.


Strategies For Elimination Of S. Typhimurium, J. Dahl, A. Wingstrand, D. L. Baggesen, Bent Nielsen Jan 1997

Strategies For Elimination Of S. Typhimurium, J. Dahl, A. Wingstrand, D. L. Baggesen, Bent Nielsen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Four different strategies were employed to try to eliminate Salmonella typhimurium from infected herds or pigs. Only strategic removal of pigs prior to entering infected sections of the herd was found to be beneficial. Strategies involving efforts to eliminate salmonella from infected pigs or herds by medication were found to be inefficient, and a vaccination strategy using a killed salmonella vaccine did not reduce subclinical infection.


Distribution Of S. Enterica Serotypes And Phage Types In Danish Pig Herds, D. L. Baggesen, J. Christensen Jan 1997

Distribution Of S. Enterica Serotypes And Phage Types In Danish Pig Herds, D. L. Baggesen, J. Christensen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

The objective of the present investigation is to describe the distribution of Salmonella enterica serotypes and phage types in Danish pig herds. The distribution of types will be described in a cross-sectional study performed in 1993-94 as well as in the routine submissions to the Danish Veterinary Laboratory in 1995 and 1996. The different designs illustrate the consequences of submission bias in the rutine materials compared to the material obtained from a random sample of pig herds.


Update On Laboratory Diagnosis Of Subclinical Salmonella Infection In Pigs, Bent Nielsen, D. L. Baggesen Jan 1997

Update On Laboratory Diagnosis Of Subclinical Salmonella Infection In Pigs, Bent Nielsen, D. L. Baggesen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Detection of Salmonella is a key point in veterinary salmonella research and surveillance programmes. The chosen method of detection, direct or indirect, highly affects our conclusions in any examination or investigation. The perfect test is characterized by having a very high specificity, sensitivity and predictive value, being easy to perform, cheap, rapid and having the possibilty oflarge scale examination by automation. So far no single test has been able to fulfil all these requirements.


Control Of Salmonella In Pig Feed, P. E. Häggblom Jan 1997

Control Of Salmonella In Pig Feed, P. E. Häggblom

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Monitoring and control of salmonella in animal feedingstuffs has been carried out in Sweden since the late 1940's (Thal et al. 1957). The feed control is an important part of the integrated Swedish preharvest control of salmonella. Much epidemiological data supports the fact that salmonella may be disseminated with the feed, one example is the serotype Salmonella Agona which originated in fish meal in S. America and rapidly spread into the animal and human populations both in the United States and Europe, now being one of the more frequent serotypes (Pivnick, 1978).


Looking For A Reliable Method To Follow The Salmonella Status Of Finishing Pigs, F. Humbert, K. Proux, M. Bohnert, F. Madec Jan 1997

Looking For A Reliable Method To Follow The Salmonella Status Of Finishing Pigs, F. Humbert, K. Proux, M. Bohnert, F. Madec

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

A study was undertaken to answer questions about the epidemiology of Salmonella in pig production. Does the Salmonella excretion from a group of pigs (on the same farm) remain constant during time or is there variations ? Where, and how many samples do we have to take to follow these variations, if they exist? Are the techniques to analyse samples (bacteriological and serological) practicable ? How is the relationship between serological and bacteriological methods?


Control Of Salmonella In Liquid Feeding Systems, Inge Dorthe Hansen Jan 1997

Control Of Salmonella In Liquid Feeding Systems, Inge Dorthe Hansen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Liquid feeding systems could be a challenge as regards Salmonella contamination in pigs, as the feed is often produced from non-controlled feed ingredients. Moreover, there is a possibility of salmonella growth in the feed. Practical systems consist of one or more mixing tanks with raw material feeding equipment, circulation pipes through all stable units fed by the system, a valve for every or every second pen and a computer to control the mixing and dosage systems. As the systems can never be emptied, there is a continous inoculation of 10 - 50 % left-over feed in the tank and the pipes, which ...


Detection Of S. Enterica In Different Materials From The Environment Of Pig Herds, D. L. Baggesen, J. Dahl, A. Wingstrand, B. Nielsen Jan 1997

Detection Of S. Enterica In Different Materials From The Environment Of Pig Herds, D. L. Baggesen, J. Dahl, A. Wingstrand, B. Nielsen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Salmonella contamination of pork carcasses as a result of subclinical salmonella infection in pig herds constitutes a menace to human health. Since 1993 there has been a national surveillance system in Denmark with the aim of monitoring and controlling salmonella infections in pig herds (Mousing et al., 1997). Application of the HACCP principles in control of salmonella infection at herd level depends on the possibility of characterizing the bacteriological status of the different sections of the herd in order to define the critical control points of the production. The objective of the present study was to characterize the microbiological status ...


Pork As A Source Of Human Slamonella Infection, H. C. Wegener, F. Bager Jan 1997

Pork As A Source Of Human Slamonella Infection, H. C. Wegener, F. Bager

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Salmonella can be transmitted from production animals to man either through direct contact at the farm or in the slaughter plant, or more frequently, by consumption of animal products. The magnitude of the risk of contracting salmonellosis by consumption of a given food product is influenced by several factors: qualitative and quantitative occurrence of salmonella, composition of the product (e.g. fat content), handling and preparation practices (e.g. cooking), susceptibility of the primary consumers (e.g. children foods), etc.


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, D. L. Baggesen Jan 1997

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, D. L. Baggesen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

An outbreak of hwnan salmonellosis caused by Salmonella enterica ssp. enterica serovar Infantis (S Infantis) involving more than 500 registered cases (Fig. I) was investigated by the use of pulsed field gel electrophoresis (PFGE).


Dose Dependent Establishment Of Subclinical S. Typhimurium Infection In Pigs And Protection Against Homologous Re-Challenge, A. Wingstrand, J. P. Nielsen, C. Heisel, D. L. Baggesen, J. Dahl Jan 1997

Dose Dependent Establishment Of Subclinical S. Typhimurium Infection In Pigs And Protection Against Homologous Re-Challenge, A. Wingstrand, J. P. Nielsen, C. Heisel, D. L. Baggesen, J. Dahl

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

The fact that the majority of Salmonella infected pig herds are subclinically infected is accepted worldwide. In subclinically infected herds shedding of salmonella from infected pigs and the contamination of the environment is markedly below the level known from herds having experienced a clinical outbreak (Baggesen et al., 1996).


Blood Sampling At Two Slaughterhouses And Serological Screening Of Salmonella Infections In Swine Using An Indirect Elisa, P. J. Van Der Wolf, W. B. Wolbers, A. R. W. Elbers, H. M. J. F. Heijden, F. W. Van Schie, W. A. Hunneman, M. J. M. Tielen Jan 1997

Blood Sampling At Two Slaughterhouses And Serological Screening Of Salmonella Infections In Swine Using An Indirect Elisa, P. J. Van Der Wolf, W. B. Wolbers, A. R. W. Elbers, H. M. J. F. Heijden, F. W. Van Schie, W. A. Hunneman, M. J. M. Tielen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

The Animal Health Service in the Netherlands is currently investigating Salmonella infections in finishing pigs in the Netherlands. The investigations combine 2 projects: the SALINPORK-project, financed by the European Union, and a national project 'Speerpunt Salmonella', financed by the Dutch Ministry of Agriculture, Nature management and Fisheries and the Dutch Product Board for Livestock and Meat.


Bacteriological And Serological Characterisation Of Slaughter Pigs From 25 Serologically Identified "Salmonella High Risk" Herds, A. Wingstrand, D. L. Baggesen, L. K. Thomsen, Bent Nielsen Jan 1997

Bacteriological And Serological Characterisation Of Slaughter Pigs From 25 Serologically Identified "Salmonella High Risk" Herds, A. Wingstrand, D. L. Baggesen, L. K. Thomsen, Bent Nielsen

International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork

Danish finishing herds are routinely screened for antibodies to Salmonella in random samples of meat juice from slaughter pigs. The herds are categorized by the seroprevalence of samples from the preceding three months into three infection levels (1, 2 and 3). Herds are allocated to level 3 ("Salmonella high risk" herds) at seroprevalences exceeding 33-50% depending on herd size (larger herds lower limit) (Mousing et al., in press).