“The most important factors that increase the risk of transmission of classical scrapie between sheep flocks are commercial trading of live animals and physical contact between sheep flocks on pasture or in breeding activities. Classical scrapie is therefore best controlled using measures that limit the degree of physical contact between sheep flocks.” says Petter Hopp.
The thesis shows, however, that scrapie Nor98 differs from classical scrapie. Hopp found no indication of contagion between flocks as a result of movement of animals. This strengthens the belief that these are two different diseases that need to be controlled using different measures. We also need to consider the possibility that scrapie Nor98 may appear spontaneously in sheep in the absence of a source of infection.
This and other research projects on scrapie at the National Veterinary Institute have contributed to an introduction by EU authorities of an altered and milder set of managerial measures against scrapie Nor98. These measures came into effect in the EU on July 1 this year, and are binding for Norway from the same date.
The farmer a central figure in combating scrapie
Hopp has also considered different strategies for the surveillance of scrapie in Norway. Experience in Norway has shown that most outbreaks of classical scrapie are discovered through the farmer himself reporting sick animals to the veterinary authorities.
The thesis also shows that Norwegian sheep farmers are generally interested in contributing to the fight against the disease, even though control measures may lead to flocks of sheep with classical scrapie being slaughtered.
“It is important to maintain and strengthen the sheep farmers’ vigilance against scrapie. We therefore need to learn more about the factors that influence farmers’ attitudes and motivation to report”, says Hopp.
Scrapie is a transmissible, chronic, neurological disease of small ruminants. The first scrapie case in a Norwegian-bred sheep flock occurred in 1981. During the 1990’s, the incidence of the disease in Norwegian flocks increased steadily, culminating with scrapie being diagnosed in 31 flocks in 1996. This led 1997 to the introduction of the Norwegian surveillance and control program for scrapie.
On December 5, 2007, Cand.Med.Vet. Petter Hopp defended his thesis for the degree of Doctor philosophiae at the Norwegian School of Veterinary Science, entitled “Epidemiological studies of scrapie in the Norwegian sheep populations.” The work was carried out at the National Veterinary Institute.
Magnhild Jenssen | alfa
Six-legged livestock -- sustainable food production
11.05.2017 | Faculty of Science - University of Copenhagen
Elephant Herpes: Super-Shedders Endanger Young Animals
04.05.2017 | Universität Zürich
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy