scholarly journals Detection of viable Dichelobacter nodosus by real-time PCR using PMAxx™ v1 (protocols.io.bbh9ij96)

protocols.io ◽  
2020 ◽  
Author(s):  
Peter Kuhnert ◽  
Tobias Hidber
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Dichelobacter Nodosus

scholarly journals Pooling of interdigital swab samples for PCR detection of virulent Dichelobacter nodosus

2017 ◽  
Vol 30 (2) ◽  
pp. 205-210 ◽  
Author(s):  
Deborah Greber ◽  
Iwan Locher ◽  
Peter Kuhnert ◽  
Marc-André Butty ◽  
Kerstin Holdener ◽  
...  
Keyword(s):  
Real Time ◽  
Sensitivity And Specificity ◽  
Real Time Pcr ◽  
Substantial Reduction ◽  
Control Program ◽  
Foot Rot ◽  
Dichelobacter Nodosus ◽  
Foot Disease ◽  
Development And Validation ◽  
Adequate Method

Virulent ovine foot rot is a contagious foot disease. Given the development and validation of a real-time PCR to detect Dichelobacter nodosus isolates that contain the virulence-associated protease genes aprV2 and aprB2, the diagnosis of foot rot has made considerable progress. We evaluated pooling methods to reduce the number of samples during a foot rot control program. Samples of individual feet were compared to a 4-feet sample of the same sheep. All further analyses based on 4-feet samples (pools-of-5 and pools-of-10 4-feet samples) were compared to samples of individual sheep, and a risk-based herd sampling was evaluated and compared to the whole flock. The sensitivity and specificity of the 4-feet samples for detection of aprV2-positive strains was 93.8% (CI: 87.6–97.5%) and 98.3% (CI: 96.5–99.3%), respectively. The sensitivity and specificity of the pools-of-10 was 86.7% (CI: 78.4–92.7%) and 100.0% (CI: 97.4–100%), respectively. Pools-of-5 were not significantly more sensitive than pools-of-10. The pooling of 4 individual foot samples into one 4-feet sample is an adequate method to reduce the number of samples of individual sheep. The sensitivity of pools-of-5 and pools-of-10 is too imprecise for a control program. Risk-based sampling allowed for a substantial reduction of samples to be tested, had a sensitivity of 95.8% (CI: 78.9–99.9%) and specificity of 100.0% (CI: 88.1–100.0%) when determining the foot rot flock status, and represents an adequate methodology to predict within-flock freedom from infection.

scholarly journals Prevalence of Dichelobacter nodosus and Ovine Footrot in German Sheep Flocks

Animals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1102
Author(s):  
Julia Storms ◽  
Anna Wirth ◽  
Danae Vasiliadis ◽  
Isabelle Brodard ◽  
Antje Hamann-Thölken ◽  
...  
Keyword(s):  
Field Study ◽  
Real Time ◽  
Causative Agent ◽  
Real Time Pcr ◽  
Scoring System ◽  
Visual Inspection ◽  
Dichelobacter Nodosus ◽  
Virulent Strains

The bacterium Dichelobacter nodosus (D. nodosus) is the causative agent of ovine footrot. The aim of this field study was to determine the prevalence of D. nodosus in German sheep flocks. The sheep owners participated voluntarily in the study. More than 9000 sheep from 207 flocks were screened for footrot scores using a Footrot Scoring System from 0 to 5 and sampling each sheep using one interdigital swab for all four feet of the sheep. The detection and discrimination between benign and virulent strains was done employing a real-time PCR. Our results showed a mean prevalence of 42.93% of D. nodosus in German sheep on an animal level. Underrunning of hoof horn on at least one foot (Scores 3-5) was detected in 567 sheep (6.13%). Sheep with four clinically healthy feet were found through visual inspection in 47.85% of all animals included in this study. In total, 1117 swabs from sheep with four clinically healthy feet tested positive for D. nodosus. In 90.35% of the positive swabs, virulent D. nodosus were detected. Benign D. nodosus were detected in 4.74% of the D. nodosus-positive swabs while 4.91% tested positive for both, benign and virulent D. nodosus. In 59 flocks D. nodosus were not detected and in 115 flocks only virulent D. nodosus were found while seven flocks tested positive for benign strains.

Feldvalidierung einer real-time PCR zum Nachweis von Mycoplasma hyopneumoniae in Nasentupfermaterial von lebenden Schweinen

2005 ◽  
Vol 147 (9) ◽  
pp. 373-379 ◽  
Author(s):  
F. Zeeh ◽  
P. Kuhnert ◽  
R. Miserez ◽  
M. G. Doherr ◽  
W. Zimmermann
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Mycoplasma Hyopneumoniae

Nutzen des hoch-sensitiven real-time-PCR HBV Tests (TaqMan) zur Prädiktion der Resistenzentwicklung bei Lamivudin-Langzeittherapie

2010 ◽  
Vol 48 (08) ◽  
Author(s):  
A Brodzinski ◽  
F van Bömmel ◽  
B Fülöp ◽  
B Schlosser ◽  
M Biermer ◽  
...  
Keyword(s):  
Real Time ◽  
Real Time Pcr

Nachweis des porzinen Circovirus Typ 2 und des Torque-Teno-Sus-Virus 1 und 2 in Samenproben von Ebern einer österreichischen Besamungsstation

2011 ◽  
Vol 39 (04) ◽  
pp. 201-204
Author(s):  
A. Griessler ◽  
E. Pirker ◽  
H. Söllner ◽  
J. Segalés ◽  
T. Kekarainen ◽  
...  
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Klinische Relevanz ◽  
Torque Teno Sus Virus

Zusammenfassung Gegenstand und Ziel: Das porzine Circovirus Typ 2 (PCV-2) und das Torque-teno-Sus-Virus (TTSuV) sind in schweineproduzierenden Ländern häufig nachzuweisen. Beide Erreger können sowohl horizontal als auch vertikal übertragen werden und Ebersamen könnte ein wichtiges Übertragungsmedium darstellen. Ziel der Studie war die Abklärung der Prävalenz dieser beiden Viren in Samenproben von Ebern. Material und Methoden: Von 100 Ebern einer Besamungsstation wurde jeweils eine Samenprobe mittels quantitativer Real-Time-PCR auf PCV-2 und mittels konventioneller PCR auf TTSuV-1 und TTSuV-2 untersucht. Ergebnisse: Nur bei einem Eber der Rasse Piétrain war ein positives PCV-2-Resultat festzustellen. TTSuV-1 ließ sich in vier Samenproben, TTSuV-2 in fünf Proben nachweisen. Ein Eber wies eine Koinfektion mit beiden TTSuV-Genotypen auf. Alle TTSuV-positiven Proben stammten von Piétrain-Ebern. Schlussfolgerung und klinische Relevanz: In der vorliegenden Studie wurde erstmals in Österreich TTSuV im Samen nachgewiesen. Die Prävalenz sowohl von TTSuV als auch von PCV-2 war gering. Die klinische Relevanz einer gleichzeitigen Kontamination des Samens mit beiden Viren ist nicht klar.

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