After working for some five years at the veterinary school, primarily in the small animal clinic, she has for the last four years been employed as a Research Fellow at the Section of Arctic veterinary Medicine, The Norwegian School of Veterinary Science in Tromsø.
The cat is the main host for Toxoplasma and spreads the infection in its droppings. Previous research has shown that isolated island groups without cats are in reality free of the parasite. Man can also be infected by eating meat from infected animals, and it can be transmitted to the embryo and deform it if the mother is infected while pregnant.
In her doctoral thesis, Kristin Wear Prestrud studied the distribution of the parasite in different animal species on Svalbard, and looked at the relationships with Toxoplasma strains in other parts of the world. Antibodies to Toxoplasma were found in the blood of the Arctic fox, polar bear, walrus, Svalbard reindeer, the sibling vole and several avian species.
Forty-three percent of the Arctic foxes sampled bore antibodies to the parasite. The incidence in polar bears was also high, and in walrus somewhat lower. Of avian species, the barnacle goose was the most common at 7% positive. The high incidence in Arctic foxes and polar bears was unexpected, because cats are forbidden on Svalbard and the only cats on the archipelago are some illegal ones at Barentsburg.
Kristin Wear Prestrud showed in her doctoral thesis that migratory birds are a probable source of infection for the parasite Toxoplasma gondii on Svalbard (the Spitsbergen archipelago), which has then infected the Arctic fox population, among other animals. The parasite can infect all animals and birds, including man, and normally produces few symptoms. It may, however, lead to the disease of toxoplasmosis, and over the years several Arctic foxes have been found dead from this infection on Svalbard.
In her thesis, Prestrud described migrating birds as a possible route of infection of Toxoplasma in the Arctic fox population on Svalbard. Genetic analyses showed that the parasite on Svalbard is identical to the most common Toxoplasma strains one finds in Europe, which supports the idea of a European source of infection on Svalbard.
Several bird species that breed on Svalbard overwinter in the more populated parts of Europe, where they might become infected. Geese, which graze on cultivated land during their migration, are especially suspect, and are a preferred prey of the Arctic fox during the summer. Transmission from mother to unborn offspring in the uterus may be significant for the Arctic fox, but probably not in polar bears, and it is likely that the level of infection in the fox and polar bear populations is also maintained by the animals eating their own species, which primarily occurs during the wintertime when available food is scarce.
Kristin W. Prestrud defended her thesis for the degree of Ph. D. at the Norwegian School of Veterinary Science, with the title "Toxoplasma gondii in the high arctic archipelago of Svalbard", on October 28, 2008.
Magnhild Jenssen | alfa
Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel
Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
For the first time, an interdisciplinary team from the University of Basel has succeeded in integrating artificial organelles into the cells of live zebrafish embryos. This innovative approach using artificial organelles as cellular implants offers new potential in treating a range of diseases, as the authors report in an article published in Nature Communications.
In the cells of higher organisms, organelles such as the nucleus or mitochondria perform a range of complex functions necessary for life. In the networks of...
19.03.2018 | Event News
16.03.2018 | Event News
13.03.2018 | Event News
22.03.2018 | Trade Fair News
22.03.2018 | Earth Sciences
22.03.2018 | Earth Sciences