Evidence supporting vertical transmission of Salmonella in dairy cattle
| Autor: | Guy H. Loneragan, T. R. Brown, D. L. Hanson, Michael E. Hume, Tom S. Edrington, David J. Nisbet |
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| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
Salmonella Veterinary medicine Epidemiology 030106 microbiology Short Report Cattle Diseases Spleen medicine.disease_cause Caecum 03 medical and health sciences medicine Animals Dairy cattle Salmonella Infections Animal biology business.industry Salmonella enterica biology.organism_classification Infectious Disease Transmission Vertical United States Small intestine zoonoses Infectious Diseases medicine.anatomical_structure Animals Newborn Gastrointestinal Infection Herd Cattle Female Lymph business |
| Zdroj: | Epidemiology and Infection |
| ISSN: | 1469-4409 0950-2688 |
| DOI: | 10.1017/s0950268815002241 |
| Popis: | SUMMARYWe set out to investigate whether Salmonella enterica could be recovered from various tissues of viable neonatal calves immediately following parturition. Eleven samples were aseptically collected from each of 20 calves and consisted of both left and right subiliac and prescapular lymph nodes (LN), mesenteric LN, spleen and liver, as well as intestinal tissue (including luminal contents) from the small intestine, caecum, spiral colon and rectum. In addition, a faecal sample was collected from 19 of the dams. Salmonella was recovered from at least one sample from 10 of the 20 neonates. Across all calves, Salmonella was recovered from 12·7% of all samples and from LN in particular, Salmonella was recovered from 10·0%, 5·0%, and 5·0% of subiliac, prescapular, and mesenteric LN, respectively. Within calves, Salmonella was recovered from 0% to 73% of samples and across tissues, estimates of Salmonella prevalence were greatest in the caecum (30%) but was never recovered from the right pre-scapular LN. These data provide evidence of vertical transmission from a dam to her fetus such that viable calves are born already infected and thereby not requiring faecal–oral exposure for transmission. This new knowledge ought to challenge – or at least add to – existing paradigms of Salmonella transmission dynamics within cattle herds. |
| Databáze: | OpenAIRE |
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