Peter Halvarsson
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View article: Major histocompatibility complex modulation of <i>Batrachochytrium dendrobatidis</i> and <i>Ranavirus</i> infections in amphibians
Major histocompatibility complex modulation of <i>Batrachochytrium dendrobatidis</i> and <i>Ranavirus</i> infections in amphibians Open
Genetic variation in immune genes is an important component of genetic diversity. The genes in the major histocompatibility complex (MHC) provide an excellent model system for studying the mechanisms that generate and maintain genetic dive…
View article: Farm size and biosecurity measures associated with <i>Strongylus vulgaris</i> infection in horses
Farm size and biosecurity measures associated with <i>Strongylus vulgaris</i> infection in horses Open
Background Selective anthelmintic treatment, advocated due to evolving anthelmintic resistance, has been associated with an increase in Strongylus vulgaris prevalence. Reverting to routine interval anthelmintic treatments is not viable and…
View article: Occurrence of fenbendazole resistance in Parascaris spp. on breeding farms in Sweden
Occurrence of fenbendazole resistance in Parascaris spp. on breeding farms in Sweden Open
Anthelmintic resistance is an increasing problem in many gastrointestinal parasites of grazing animals. Among these, the equine roundworm, Parascaris spp., has developed wide-spread resistance to macrocyclic lactones over the past decades.…
View article: Farm size and biosecurity measures associated with Strongylus vulgaris infection in horses
Farm size and biosecurity measures associated with Strongylus vulgaris infection in horses Open
Background: Selective anthelmintic treatment, advocated due to evolving anthelmintic resistance, has been associated with an increase in Strongylus vulgaris prevalence. Reverting to routine interval anthelmintic treatments is not viable an…
View article: A pound for information or a penny for cure: Farmers' economic decisions on testing and treatment of livestock diseases
A pound for information or a penny for cure: Farmers' economic decisions on testing and treatment of livestock diseases Open
Livestock productivity and profitability are threatened by livestock diseases. In this study, we examine farmers' revealed preferences for testing and treating gastrointestinal parasites in sheep in Sweden, taking into account the sequenti…
View article: Inbreeding and genetic load in a pair of sibling grouse species: Tetrastes sewersowi and T. bonasia
Inbreeding and genetic load in a pair of sibling grouse species: Tetrastes sewersowi and T. bonasia Open
Genetic load and inbreeding are recognized as important factors to be considered in conservation programs. Elevated levels of both can increase the risk of population extinction by negatively impacting fitness-related characters in many sp…
View article: Gastrointestinal parasite community structure in horses after the introduction of selective anthelmintic treatment strategies
Gastrointestinal parasite community structure in horses after the introduction of selective anthelmintic treatment strategies Open
A relatively new method to study the species richness and diversity of nematode parasites in grazing animals is to perform deep sequencing on composite samples containing a mixture of parasites. In this work, we compared species compositio…
View article: Association between the skin microbiome and <scp>MHC</scp> class <scp>II</scp> diversity in an amphibian
Association between the skin microbiome and <span>MHC</span> class <span>II</span> diversity in an amphibian Open
Microbiomes play an important role in determining the ecology and behaviour of their hosts. However, questions remain pertaining to how host genetics shape microbiomes, and how microbiome composition influences host fitness. We explored th…
View article: Retained efficacy of ivermectin against cyathostomins in Swedish horse establishments practicing selective anthelmintic treatment
Retained efficacy of ivermectin against cyathostomins in Swedish horse establishments practicing selective anthelmintic treatment Open
Cyathostominae are ubiquitous to grazing horses and regarded the most prevalent internal parasite in the horse. Unfortunately, decades of indiscriminate use of anthelmintic drugs have resulted in the development of resistance in cyathostom…
View article: The Major Histocompatibility Complex modulates<i>Batrachochytrium dendrobatidis</i>and<i>Ranavirus</i>infections in three amphibian species
The Major Histocompatibility Complex modulates<i>Batrachochytrium dendrobatidis</i>and<i>Ranavirus</i>infections in three amphibian species Open
Genetic variation of immune genes is an important component of genetic diversity. Major histocompatibility complex (MHC) genes have been put forward as a model for studying how genetic diversity is maintained and geographically distributed…
View article: Association between the skin microbiome and MHC class II diversity in an amphibian
Association between the skin microbiome and MHC class II diversity in an amphibian Open
It has become clear that the microbiome plays an important role in determining host health, diseases, and phenotypic variation. There is increasing evidence that the microbiome influences host fitness and its adaptation to the environment …
View article: Parasitic strongyle nemabiome communities in wild ruminants in Sweden
Parasitic strongyle nemabiome communities in wild ruminants in Sweden Open
Background Wildlife hosts may serve as reservoirs for strongyles which can be transmitted to domestic livestock. Therefore, we aimed to assess the risk for transmission of important nematode pathogens to domestic sheep in Sweden. The main …
View article: Farmers' perception on the control of gastrointestinal parasites in organic and conventional sheep production in Sweden
Farmers' perception on the control of gastrointestinal parasites in organic and conventional sheep production in Sweden Open
A questionnaire was sent to sheep owners in Sweden to get information about anthelmintic drug use. The survey also investigated how respondents experienced problems with gastrointestinal nematode infections (GIN) focusing on Haemonchus con…
View article: Exploring the β-tubulin gene family in a benzimidazole-resistant Parascaris univalens population
Exploring the β-tubulin gene family in a benzimidazole-resistant Parascaris univalens population Open
Benzimidazole (BZ) drugs are frequently used to treat infections with the equine ascarid Parascaris univalens due to increasing resistance to macrocyclic lactones and pyrantel. Benzimidazole resistance is rare in ascarids in contrast to st…
View article: A novel duplex ddPCR assay for detection and differential diagnosis of Ascaridia galli and Heterakis gallinarum eggs from chickens feces
A novel duplex ddPCR assay for detection and differential diagnosis of Ascaridia galli and Heterakis gallinarum eggs from chickens feces Open
Since the EU ban on battery cages, many studies have listed Ascaridia galli and Heterakis gallinarum as the most common roundworms in the European laying hen population. A complicating factor is that the eggs of these parasites are almost …
View article: First report on reduced efficacy of ivermectin on Oesophagostomum spp. on Swedish pig farms
First report on reduced efficacy of ivermectin on Oesophagostomum spp. on Swedish pig farms Open
Anthelmintic efficacy was investigated in nine sow herds that had been identified with high faecal egg counts in a prevalence study. Faecal samples were collected from a total of 104 individual sows, and analysed using a centrifugal flotat…