Dissertation/ Thesis
Development of predictive tenacity models for Campylobacter along the raw milk supply chain ; Entwicklung von Modellen zur Vorhersage der Widerstandsfähigkeit von Campylobacter entlang der Warenkette Rohmilch
| العنوان: | Development of predictive tenacity models for Campylobacter along the raw milk supply chain ; Entwicklung von Modellen zur Vorhersage der Widerstandsfähigkeit von Campylobacter entlang der Warenkette Rohmilch |
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| المؤلفون: | Knipper, Anna-Delia |
| المساهمون: | female, Alter, Thomas, Franz, Charles, Tenhagen, Bernd-Alois |
| سنة النشر: | 2024 |
| المجموعة: | FU Berlin: Refubium |
| مصطلحات موضوعية: | dairy cows, campylobacteriosis, food safety, food hygiene, public health, risk assessment, ddc:636 |
| الوصف: | In the last years many foodborne outbreaks in Germany were caused by Campylobacter spp. in raw milk that had not been properly heat treated prior to consumption. Feces from Campylobacter-colonized cows pose a risk for cross-contamination of teats, which can transfer the Campylobacter spp. contamination into raw milk during the milking process. The aim was to identify and fill data gaps regarding Campylobacter spp. transfer along the supply chain of raw milk and to investigate its survival in raw milk. Finally, possible intervention strategies to minimize the risk from raw milk consumption were outlined. A systematic review and meta-analysis was performed to summarize previous research on Campylobacter spp. in feces of dairy cows worldwide. The prevalence varied widely from 0-100%. Only limited quantitative data on Campylobacter spp. in the feces of dairy cows were available. The reported Campylobacter mean concentrations ranged between 2.1 and 4.17 log CFU/g feces. A longitudinal study was performed to investigate the transmission of Campylobacter spp. along the raw milk supply chain. The investigated samples comprised rectal feces, boot socks, teat skin swabs, milking cluster swabs, raw milk and milk filters. Samples were analyzed for the presence and concentration of Campylobacter spp., E. coli, total aerobic colony count (TACC) and for Pseudomonas spp. In total, Campylobacter spp. were detected in 77.1% of the fecal samples with an average concentration of 2.43 ± 0.9 log CFU/g. Of the boot sock samples 29.2% were tested positive with a mean concentration of 3.01 ± 1.05 log CFU/two socks. Among the teat swabs, 12.2% tested positive for Campylobacter spp. None of the milking clusters were positive. Only one raw milk sample and the milk filter tested positive on the same day. In addition, on this day nine teat swab samples were tested positive for Campylobacter spp. The results showed that contamination of raw milk, albeit rare, can occur. The survival of C. jejuni was investigated by two different methods, ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| وصف الملف: | VIII, 148 Seiten; application/pdf |
| اللغة: | German English |
| Relation: | https://refubium.fu-berlin.de/handle/fub188/42603; http://dx.doi.org/10.17169/refubium-42327; urn:nbn:de:kobv:188-refubium-42603-0 |
| DOI: | 10.17169/refubium-42327 |
| الاتاحة: | https://refubium.fu-berlin.de/handle/fub188/42603 https://doi.org/10.17169/refubium-42327 https://nbn-resolving.org/urn:nbn:de:kobv:188-refubium-42603-0 |
| Rights: | http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen |
| رقم الانضمام: | edsbas.BB2CEAA7 |
| قاعدة البيانات: | BASE |
| DOI: | 10.17169/refubium-42327 |
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