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Erik G Granquist Mona Aleksandersen Karin Bergström Stephen J Dumler Wenche O Torsteinbø Snorre Stuen 《Acta veterinaria Scandinavica》2010,52(1):43
Background
Anaplasma phagocytophilum is the causative agent of human granulocytic anaplasmosis (HGA) in humans and tick-borne fever (TBF) in ruminants. The bacterium invades and replicates in phagocytes, especially in polymorphonuclear granulocytes. 相似文献2.
Polar Biology - It is of critical importance to identify factors that affect harbour seal haul-out patterns to improve the accuracy of harbour seal censuses. In this study, haul-out patterns of... 相似文献
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Snorre Stuen Lise Grøva Erik G Granquist Karin Sandstedt Ingrid Olesen Håvard Steinshamn 《Acta veterinaria Scandinavica》2011,53(1):8
Background
It has been questioned if the old native Norwegian sheep breed, Old Norse Sheep (also called Norwegian Feral Sheep), normally distributed on coastal areas where ticks are abundant, is more protected against tick-borne infections than other Norwegian breeds due to a continuously high selection pressure on pasture. The aim of the present study was to test this hypothesis in an experimental infection study. 相似文献4.
Erik G Granquist Kjetil Bårdsen Karin Bergström Snorre Stuen 《Acta veterinaria Scandinavica》2010,52(1):1-7
Background
Anaplasma phagocytophilum is the causative agent of tick-borne fever in ruminants and human granulocytotropic anaplasmosis (HGA). The bacterium is able to survive for several months in immune-competent sheep by modifying important cellular and humoral defence mechanisms. Little is known about how different strains of A. phagocytophilum propagate in their natural hosts during persistent infection.Methods
Two groups of five lambs were infected with each of two 16S rRNA gene variants of A. phagocytophilum, i.e. 16S variant 1 which is identical to GenBank no M73220 and 16S variant 2 which is identical to GenBank no AF336220, respectively. The lambs were infected intravenously and followed by blood sampling for six months. A. phagocytophilum infection in the peripheral blood was detected by absolute quantitative real-time PCR.Results
Both 16S rRNA gene variants of A. phagocytophilum established persistent infection for at least six months and showed cyclic bacteraemias, but variant 1 introduced more frequent periods of bacteraemia and higher number of organisms than 16S rRNA gene variant 2 in the peripheral blood.Conclusion
Organisms were available from blood more or less constantly during the persistent infection and there were individual differences in cyclic activity of A. phagocytophilum in the infected animals. Two 16S rRNA gene variants of A. phagocytophilum show differences in cyclic activity during persistent infection in lambs. 相似文献5.
Lene Idland Erik G. Granquist Marina Aspholm Toril Lindbäck 《Journal of applied microbiology》2022,132(5):3959-3972
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We presented territorial male three-spined sticklebacks, Gasterosteus aculeatus, two stationary dummies simultaneously, each simulating an equally gravid female. Both dummies featured the head-up orientation indicative of a sexually receptive female but differed in more subtle aspects of posture. In one dummy the back and tail were moulded in a relaxed straight posture and the other was moulded with the raised tail and concave back posture (lordosis), which mating tests revealed to be a strong predictor of spawning readiness in females. Males courted both dummies but directed more to the lordosis posture. Male sticklebacks thus recognize and respond appropriately to relatively subtle features of female posture in addition to other cues such as the head-up angle and dorsal barring reported in earlier studies. Physiological or morphological constraints may make the lordosis posture a reliable, and hence relatively honest, indicator of spawning readiness in females. Males may therefore enhance their fitness by preferentially courting females that assume this posture. Copyright 2002 The Association for the Study of Animal Behaviour. Published by Elsevier Science Ltd. All rights reserved. 相似文献
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