Hannah Joan Jørgensen
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Hannah Joan Jørgensen has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Bereket Tesfamichael
Norwegian Veterinary Institute, P.O. Box 750 Sentrum, 0106 Oslo, Norway
1 shared publication - Lisbeth Hektoen
Norwegian Sheep Health Service, Animalia, Oslo, Norway
1 shared publication - Maren Knappe-Poindecker
Norwegian University of Life Sciences, Oslo, Norway
1 shared publication - Martha Jakobsen Ulvund
Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Sandnes, Norway
1 shared publication - Terje Fjeldaas
Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Ås, Norway
1 shared publication - Tim Kåre Jensen
University of Copenhagen
1 shared publication
Latest Publications
- Open Access
- 25 September 2015
- Published by Springer Nature in Acta Veterinaria Scandinavica
- Vol. 57 (1) , 1-5
Experimental infection of cattle with ovine Dichelobacter nodosus isolates
Background: Dichelobacter nodosus is the main causative agent of ovine footrot, and there are strong indications that the bacterium can be transferred to cattle grazing on the same pasture as sheep. The aim of this study was to investigate if benign and virulent D. nodosus strains isolated from sheep can be transferred to the interdigital skin of cattle under experimental conditions. Further, we wanted to observe the impact of such infection on bovine foot health, and test the effect of topical chlortetracycline (Cyclo spray ® : Eurovet) on the infection. Findings: Six heifers were included in the study. After an initial 18-day maceration period, three heifers were inoculated on one single foot with a benign strain and three with a virulent strain by adding bacterial suspension in a bandage. The bandages were left on for 17 days, and when removed, D. nodosus was isolated from all six heifers. All six heifers developed interdigital dermatitis. In five of the heifers D. nodosus organisms were demonstrated within the epidermis. Twenty-four days after treatment with chlortetracycline all heifers were negative by cultivation, but tested positive for D. nodosus by polymerase chain reaction (PCR). Two of the six heifers still tested positive for D. nodosus by PCR 49 days after treatment. After 70 days, all heifers tested negative for D. nodosus . Conclusions: This study shows that both virulent and benign D. nodosus strains originating from sheep can be transferred to naïve heifers under experimental conditions. Further, the study supports the hypothesis that infections with virulent D. nodosus in cattle are associated with interdigital dermatitis. No conclusion regarding the treatment of D. nodosus infection with chlortetracycline was possible.
- 25 September 2015
- Published by Springer Nature in Acta Veterinaria Scandinavica
- Vol. 57 (1) , 1-5
Open AccessExperimental infection of cattle with ovine Dichelobacter nodosus isolates
Background: Dichelobacter nodosus is the main causative agent of ovine footrot, and there are strong indications that the bacterium can be transferred to cattle grazing on the same pasture as sheep. The aim of this study was to investigate if benign and virulent D. nodosus strains isolated from sheep can be transferred to the interdigital skin of cattle under experimental conditions. Further, we wanted to observe the impact of such infection on bovine foot health, and test the effect of topical chlortetracycline (Cyclo spray ® : Eurovet) on the infection. Findings: Six heifers were included in the study. After an initial 18-day maceration period, three heifers were inoculated on one single foot with a benign strain and three with a virulent strain by adding bacterial suspension in a bandage. The bandages were left on for 17 days, and when removed, D. nodosus was isolated from all six heifers. All six heifers developed interdigital dermatitis. In five of the heifers D. nodosus organisms were demonstrated within the epidermis. Twenty-four days after treatment with chlortetracycline all heifers were negative by cultivation, but tested positive for D. nodosus by polymerase chain reaction (PCR). Two of the six heifers still tested positive for D. nodosus by PCR 49 days after treatment. After 70 days, all heifers tested negative for D. nodosus . Conclusions: This study shows that both virulent and benign D. nodosus strains originating from sheep can be transferred to naïve heifers under experimental conditions. Further, the study supports the hypothesis that infections with virulent D. nodosus in cattle are associated with interdigital dermatitis. No conclusion regarding the treatment of D. nodosus infection with chlortetracycline was possible.