Blar i Institutt for natur, helse og miljø på forfatter "Rosef, Olav"
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Anaplasma in ticks feeding on migrating birds and questing ticks in Lithuania and Norway
Paulauskas, Algimantas; Radzijevskaja, Jana; Rosef, Olav (Journal article; Peer reviewed, 2009-04-15) -
Comparison of Norwegian poultry, waterborne and clinical isolates of Campylobacter jejuni by ribotyping
Rosef, Olav; Paulauskas, Algimantas; Grude, Nils; Haslekås, Camilla; Jenkins, Andrew (Journal article; Peer reviewed, 2009)Campylobacteriosis is the most frequently occurring food and waterborne gastroenteritis in Norway and 90% of cases are caused by Campylobacter jejuni. Campylobacteriosis is epidemiologically associated with use of ... -
Detection of tick-borne pathogens by molecular methods
Paulauskas, Algimantas; Radzijevskaja, Jana; Ambrasiene, Daiva; Rosef, Olav (Journal article; Peer reviewed, 2008)The use of molecular methods such as species-specific PCR, Multiplex-PCR, RT-PCR, reverse line blot hybridisation in investigations of tick-borne pathogens allowed to detect and identify the causative agents of Lyme ... -
Diversity in prevalence and genospecies of Borrelia burgdorferi sensu lato in Ixodes ricinus ticks and rodents in Lithuania and Norway
Paulauskas, Algimantas; Ambrasiene, Daiva; Radzijevskaja, Jana; Rosef, Olav; Turčinavičienė, Jurga (Journal article; Peer reviewed, 2008)A total of 1679 questing Ixodes ricinus ticks collected in Lithuania and 535 I. ricinus ticks collected in Norway from locations with different habitats were investigated for the presence of Borrelia burgdorferi sensu lato. ... -
Diversity of thermophilic Campylobacter isolated from slaughter pigs in Norway
Rosef, Olav; Paulauskas, Algimantas; Stølan, Aud; Bråthen, Elisabeth Moen; Haslekås, Camilla (Journal article; Peer reviewed, 2008)Out of 100 faecal swab samples, 88 thermophilic Campylobacter representing ten herds were isolated. The species were identified by biotyping and multiplex polymerase chain reaction (PCR). Of the isolates, 86 (97.7%) were ... -
Diversity of thermophilic Campylobacter isolated from the Bø River, Southeast Norway
Rosef, Olav; Paulauskas, Algimantas; Stølan, Aud; Bråthen, Elisabeth Moen (Journal article; Peer reviewed, 2009)Out of 125 samples we isolated 45 thermophilic Campylobacter spp. from Bø River by filtration followed by growth on selective agar plates. The species were identified by biotyping, multiplex PCR and riboprinting. C. jejuni ... -
Genetic structure in an expanding cervid population after population reduction
Haanes, Hallvard; Røed, Knut H.; Flagstad, Øystein; Rosef, Olav (Journal article; Peer reviewed, 2009)The Norwegian red deer population (Cervus elaphus) was from the mid eighteenth to the early twentieth century drastically reduced in size and distribution but has the last century expanded both demographically and spatially. ... -
Genetic variation of ticks (Ixodes ricinus L.) in the Lithuanian and Norwegian populations
Paulauskas, Algimantas; Radzijevskaja, Jana; Rosef, Olav; Turčinavičienė, Jurga; Ambrasiene, Daiva; Makareviciute, Dovile (Journal article; Peer reviewed, 2006)RAPD markers were used to measure the genetic diversity of 119 individuals of Ixodes ricinus collected from Lithuania and Norway. The samples were analysed within and also between the populations. We analysed 74 loci in ... -
Haematological and serum biochemical reference values in free-ranging red deer (Cervus elaphus atlanticus)
Rosef, Olav; Nystøyl, Håvard L.; Solenes, Tore; Arnemo, Jon Martin (Journal article; Peer reviewed, 2004)Analyses of haematological and biochemical constituents were carried out on the Norwegian subspecies of free-ranging red deer (Cervus elaphus atlanticus). All animals were captured from January to March by using a mixture ... -
Infestation of mice and voles with Ixodes ricinus ticks in Lithuania and Norway
Paulauskas, Algimantas; Radzijevskaja, Jana; Rosef, Olav; Turčinavičienė, Jurga; Ambrasiene, Daiva (Journal article; Peer reviewed, 2009)A total of 693 small rodents were live-trapped in Lithuania and Norway. In Lithuania, the mice Apodemus flavicollis and A. agrarius were more frequently infested with ticks than the voles Microtus arvalis and Myodes ... -
Infestation with Ixodes ricinus ticks on migrating passerine birds in Lithuania and Norway
Paulauskas, Algimantas; Rosef, Olav; Galdikaite, Egle; Radzijevskaja, Jana (Journal article; Peer reviewed, 2009)Ticks are known to carry several pathogenic agents of human diseases. To define the role of migrating birds as host and disseminators of ticks in Lithuania and Norway we analysed immature stage of ticks feeding on different ... -
Investigation of small rodents as reservoirs hosts of Borrelia burgdorferi sensu lato in Lithuania and Norway
Radzijevskaja, Jana; Paulauskas, Algimantas; Rosef, Olav (Conference object, 2006) -
Investigations of waterborne pathogens in Eurasian beaver (Castor fiber) from Telemark county, Southeast Norway
Rosell, Frank; Rosef, Olav; Parker, Howard (Journal article; Peer reviewed, 2001)The presence of pathogenic bacteria and parasites in drinking water is a well-known cause of human disease outbreaks. There is however, a lack of knowledge of the contamination routes to water. In Norway, the supply of ... -
Koppermangel hos oppdrettshjort
Rosef, Olav; Fimreite, Norvald; Egeland, Bjørn (Journal article; Peer reviewed, 2001)Raising red deer in enclosures for meat production is a relatively new practice in Norway and is based on national stocks (Cervus elaphus atlanticus). Presently only 400 - 500 hinds are reared in enclosures by 25 ... -
Longitudinal studies on Listeria monocytogenes and other Listeria species in two salmon processing plants
Klæboe, Halvdan; Rosef, Olav; Sæbø, Mona (Journal article; Peer reviewed, 2005)Two plants processing salmon fillets and cold smoked salmon were investigated for occurrence of Listeria in products and the environment. Analyses were conducted for a period of 31 weeks. At plant A, 252 samples were ... -
Malnutrition in farmed red deer hinds (Cervus elaphus atlanticus) in Norway
Rosef, Olav; Arnemo, Jon Martin (Research report, 2005)Malnutrition was studied in farmed red deer. Malnourished animals did not recover from winter energy loss, remained in poor condition throughout the summer, and some died of starvation. Liver analysis of one hind that died ... -
Microsatellites with variation and heredity applicable to genetic studies of Norwegian red deer (Cervus elaphus atlanticus)
Haanes, Hallvard; Rosef, Olav; Veiberg, Vebjørn; Røed, Knut H. (Journal article, 2005) -
Norsk hjort (Cervus elaphus atlanticus) og ernæringsbetingede sykdommer
Rosef, Olav (Research report, 2005) -
Petrifilm TM som alternativt medium for dyrking av bakterier i vann
Rosef, Olav; Odland, Arvid; Bjerketvedt, Dag (Journal article, 2002)Metoden NS-EN ISO 6222 er sammenlignet med Petrifilm for påvisning og telling av mikroorganismer i overflatevann (råvann) og i drikkevann (behandlet vann). De dyrkingstemperaturene som gjeldende drikkevannsforskrift angir ... -
Prevalence of Anaplasma phagocytophilum and Babesia divergens in Ixodes ricinus ticks from Lithuania and Norway
Radzijevskaja, Jana; Paulauskas, Algimantas; Rosef, Olav (Journal article; Peer reviewed, 2008)We detected Anaplasma phagocytophilum and Babesia divergens in Ixodes ricinus ticks collected from different locations in Lithuania and Norway by using the Taq Man based real-time PCR method. The msp2 gene of A. phagocytophilum ...