An evaluation of the ability of Dichelobacter nodosus to survive in soil

Cederlöf, Sara Ellinor; Hansen, Thorkild B.; Klaas, Ilka Christine; Angen, Øystein

doi:10.1186/1751-0147-55-4

Cited by 20 publications

(8 citation statements)

References 8 publications

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“…3 ). It is not clear why these two results appear contradictory, but a laboratory study of survival of D. nodosus in small soil microcosms indicated that survival is longer at 5 °C than 15 °C ( Cederlof et al., 2013 ). Other key factors for survival and transmission include moisture level (the farm studied here had high rainfall), soil type and possibly localised evolution of D. nodosus strains ( Russell et al., 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Dynamics and impact of footrot and climate on hoof horn length in 50 ewes from one farm over a period of 10 months

Smith

Green

Calvo-Bado

et al. 2014

The Veterinary Journal

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Footrot, including interdigital dermatitis, is caused by Dichelobacter nodosus cause the majority of lameness in sheep in the UK. Lame sheep often have overgrown hoof horn but recent evidence has indicated that trimming overgrown hoof horn increases recovery time, and that routine foot trimming of the flock does not reduce the prevalence or incidence of lameness. The objectives of this study were to investigate the temporal associations between hoof horn length, footrot and climate. Fifty multiparous ewes were monitored for 10 months. On eight occasions hoof horn length, foot lesions and body condition were recorded. At the first examination, ewes were assigned to one of two treatment groups. All ewes that became lame with footrot were treated at one time point per week, either by trimming hoof horn and applying a topical antibiotic spray or with parenteral antibiotic and topical antibiotic spray.Hoof horn length in ewes at pasture varied over the year and was associated with temperature and rainfall. New cases of footrot occurred all year round and were associated with prior prevalence of footrot in the flock and prior temperature and rainfall. Overgrown hoof horn did not precede lameness but occurred once the sheep were lame. One year of prompt treatment of footrot reduced the range in hoof horn length in the sheep in both treatment groups. At the end of the study the hoof lengths of ewes in both groups were not significantly different. On this farm, hoof horn length was self-regulating in both non-lame and treated lame sheep whether trimming was part of the treatment or not and there would have been no benefit from routine foot trimming of this flock.

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Section: Discussionmentioning

confidence: 99%

Dynamics and impact of footrot and climate on hoof horn length in 50 ewes from one farm over a period of 10 months

Smith

Green

Calvo-Bado

et al. 2014

The Veterinary Journal

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“…Housing ewes in the barn at higher stocking density for the 3-month period around lambing (up to week 30) likely contributed to increased FR prevalence and severity. It is known that environmental factors play an important role in determining infection rate and progression of FR severity, with heavier infection rates occurring under warm moist conditions [50] - [52] . Dichelobacter nodosus , one of the main organisms associated with FR is an anaerobic and fastidious bacterium that colonizes the interdigital epithelial tissue more readily during the wet seasons of spring, fall, and winter.…”

Section: Discussionmentioning

confidence: 99%

Selenium Supplementation Restores Innate and Humoral Immune Responses in Footrot-Affected Sheep

et al. 2013

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Dietary selenium (Se) alters whole-blood Se concentrations in sheep, dependent upon Se source and dosage administered, but little is known about effects on immune function. We used footrot (FR) as a disease model to test the effects of supranutritional Se supplementation on immune function. To determine the effect of Se-source (organic Se-yeast, inorganic Na-selenite or Na-selenate) and Se-dosage (1, 3, 5 times FDA-permitted level) on FR severity, 120 ewes with and 120 ewes without FR were drenched weekly for 62 weeks with different Se sources and dosages (30 ewes/treatment group). Innate immunity was evaluated after 62 weeks of supplementation by measuring neutrophil bacterial killing ability. Adaptive immune function was evaluated by immunizing sheep with keyhole limpet hemocyanin (KLH). The antibody titer and delayed-type hypersensitivity skin test to KLH were used to assess humoral immunity and cell-mediated immunity, respectively. At baseline, FR-affected ewes had lower whole-blood and serum-Se concentrations; this difference was not observed after Se supplementation. Se supplementation increased neutrophil bacterial killing percentages in FR-affected sheep to percentages observed in supplemented and non-supplemented healthy sheep. Similarly, Se supplementation increased KLH antibody titers in FR-affected sheep to titers observed in healthy sheep. FR-affected sheep demonstrated suppressed cell-mediated immunity at 24 hours after intradermal KLH challenge, although there was no improvement with Se supplementation. We did not consistently prevent nor improve recovery from FR over the 62 week Se-treatment period. In conclusion, Se supplementation does not prevent FR, but does restore innate and humoral immune functions negatively affected by FR.

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“…In summer the temperature rises as high as 37 o C. During winter the temperature stays below 12.6 o C. The humidity varies between 71% and 90% (http://www.mymensingh.gov.bd). This environmental condition is favourable for the survival of both Dichelobacter nodosus and Fusobacterium necrophorum (Cederlof et al, 2013). This may contribute to the higher prevalence (4.2%) of ovine footrot in this region (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Prevalence of ovine footrot in Brahmaputra Chars (shoals) in Mymensingh

et al. 2016

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A retrospective cohort study was conducted from July 2012 to August 2013 to determine prevalence of ovine footrot in chars (Shoals) of Mymensingh Sadar Upazila, Bangladesh, centred in Paranganj Union Parishad. A field survey used a prepared questionnaire and investigation of farm management. The prevalence of ovine footrot was 4.2% in the study group of 687 sheep, in 106 farms. The prevalence differed according to farm type and housing system. Prevalence of ovine footrot was higher (9.5%) in farms where sheep and other livestock were housed under the same roof. Prophylactic medication and footbath practice were absent. Common care and management practices were sheep bath, house and floor cleaning, deworming, and therapeutic medication. Highest prevalence (7.0%) was recorded in farms where prophylactic medication and deworming was irregular, and antiseptics were not used in sheep bathing and cleaning of sheep house and floor. The results suggest that improvement of the housing environment and management practices are required to control footrot. (Bangl. vet.

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An evaluation of the ability of Dichelobacter nodosus to survive in soil

Cited by 20 publications

References 8 publications

Dynamics and impact of footrot and climate on hoof horn length in 50 ewes from one farm over a period of 10 months

Dynamics and impact of footrot and climate on hoof horn length in 50 ewes from one farm over a period of 10 months

Selenium Supplementation Restores Innate and Humoral Immune Responses in Footrot-Affected Sheep

Prevalence of ovine footrot in Brahmaputra Chars (shoals) in Mymensingh

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