Opinion of the Scientific Panel on biological hazards (BIOHAZ) related to the use of vaccines for the control of Salmonella in poultry

,

doi:10.2903/j.efsa.2004.114

Cited by 13 publications

(2 citation statements)

References 98 publications

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“…Sources from the field indicate that the majority of flocks of broiler breeders in the Netherlands are vaccinated during the rearing period, mostly with live vaccines and, sometimes, (also) with an inactivated vaccine. However, there are still some questions remaining about the influence of vaccination on the possibility of low or intermittent excretion of Salmonella, thereby, demonstrating a temporary positive flock [5,20]. Based on the available information, the probability assessment for this factor was rated low.…”

Section: Vaccinationmentioning

confidence: 99%

Qualitative Evaluation of Causes for Routine Salmonella Monitoring False-Positive Test Results in Dutch Poultry Breeding Flocks

Costa¹,

Elbers²,

Koene

et al. 2021

Microorganisms

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The Salmonella monitoring program, as outlined in the EU Commission regulation 200/2010, asks for repeated sampling in order to ascertain progress in achievement of the EU target. According to Article 2.2.2.2.c of this regulation, the competent authority may decide to do a resample and retest when it has reasons to question the results of initial testing. In the Netherlands, the competent authorities have been resampling and retesting all initial positive samplings for several years because of doubts about false positive initial test results. An analysis of population data in the period 2015–2019 indicates that 48% of initial samplings at the farm were classified as false positive after resampling and retesting by the competent authorities. A qualitative analysis, assessing factors that could be associated with the occurrence of false positives, indicates that cross-contamination during the sampling process by the poultry farmer is probably the most likely source. Cross-contamination of samples during transport from the farm to the laboratory and/or cross-contamination at the laboratory are also considered possible sources. Given the slightly non-optimal system-specificity of the Salmonella monitoring program, there is good reason to make, or consider, standard resampling and retesting of initial positive results by the competent veterinary authorities possible within the EU.

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Section: Vaccinationmentioning

confidence: 99%

Qualitative Evaluation of Causes for Routine Salmonella Monitoring False-Positive Test Results in Dutch Poultry Breeding Flocks

Costa¹,

Elbers²,

Koene

et al. 2021

Microorganisms

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“…Other vaccinations against Salmonella are voluntary but can play a significant role in supporting the overall control efforts. Most European countries allow and support the use of live vaccines in poultry, and some even offer subsidies [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Validation of RT-PCR Assays to Differentiate Salmonella Vaccine Strains from Wild-Type Field Isolates

Ceyssens,

Mueller-Doblies,

Mattheus

2024

Veterinary Sciences

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The timely differentiation of the AviPro Salmonella VAC T and VAC E strains from the wild-type Salmonella enterica ser. Typhimurium and ser. Enteritidis isolates is crucial for effectively monitoring veterinary isolates. Currently, the distinction between field and vaccine strains has been conducted routinely via phenotypic antimicrobial resistance testing since the vaccines were first introduced more than 20 years ago, and the differentiation based on the antimicrobial resistance profile is still a valid and well-established method. However, an alternative method was sought for those laboratories that prefer a PCR-based method for logistic and/or operational reasons. In this study, we developed two triplex Real-Time PCR reactions that targeted conserved and specific mutations and, therefore, enabled the reliable differentiation of field and vaccine strains. To validate the effectiveness of both assays, we extensively tested them on a dataset consisting of 405 bacterial strains. The results demonstrated a 100% sensitivity and specificity for distinguishing both Salmonella enterica ser. Typhimurium and Enteritidis, although a confirmed culture is required.

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Dietary Supplementation of Brevibacillus laterosporus S62-9 Improves Broiler Growth and Immunity by Regulating Cecal Microbiota and Metabolites

Zhi

Liu

et al. 2023

Probiotics & Antimicro. Prot.

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Opinion of the Scientific Panel on biological hazards (BIOHAZ) related to the use of vaccines for the control of Salmonella in poultry

Cited by 13 publications

References 98 publications

Qualitative Evaluation of Causes for Routine Salmonella Monitoring False-Positive Test Results in Dutch Poultry Breeding Flocks

Qualitative Evaluation of Causes for Routine Salmonella Monitoring False-Positive Test Results in Dutch Poultry Breeding Flocks

Design and Validation of RT-PCR Assays to Differentiate Salmonella Vaccine Strains from Wild-Type Field Isolates

Dietary Supplementation of Brevibacillus laterosporus S62-9 Improves Broiler Growth and Immunity by Regulating Cecal Microbiota and Metabolites

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