Skip to main content
Advanced Search

Filters: Tags: pathogen (X)

6 results (11ms)   

View Results as: JSON ATOM CSV
thumbnail
Theory of the evolution of pathogen specialization suggests that a specialist pathogen gains high fitness in one host, but this comes with fitness loss in other hosts. By contrast, a generalist pathogen does not achieve high fitness in any host, but gains ecological fitness by exploiting different hosts, and has higher fitness than specialists in non-specialized hosts. As a result, specialist pathogens are predicted to have greater variation in fitness across hosts, and generalists would have lower fitness variation across hosts. We test these hypotheses by measuring pathogen replicative fitness as within-host viral loads from the onset of infection to the beginning of virus clearance, using the rhabdovirus infectious...
thumbnail
This dataset shows locations of the plant pathogen Phytophthora ramorum in Oregon.
Viral hemorrhagic septicemia virus (VHSV) is an aquatic rhabdovirus causing severe disease in numerous freshwater and saltwater fish species. Initially the virus was been found to cause disease in European fish populations starting around 1938 and was first detected in North America in the late 1980s. Of the four VHSV genotypes (I, II, III, and IV), the North American subtype IVb isolates have a broad host range. To determine whether endangered pallid sturgeon Scaphirhynchus albus, are susceptible to VHSV-IVb infection, juvenile pallid sturgeon and two pallid sturgeon cell lines derived from skin and spleen tissue were tested. Detection of viable virus via a plaque assay and molecular detection of the virus results...
thumbnail
Total Basal Area (BA) for all tree species is in square feet per acre.To monitor the potential hazards posed by invasive pathogens, the U.S. Forest Service’s Forest Health Technology Enterprise Team (FHTET) created a national database designed to assess the potential hazards on tree mortality and identify forest ecosystems at risk of invasive or pathogenic threats.When the introduction or increased activity of invasive or pathogenic plant and animal species dramatically alters the structure and function of ecosystems, the benefits that those ecosystems provide to people are also affected. Additionally, the negative effects of forest pathogens and invasives on certain species may be exacerbated by climate change,...
During a survey of fungi associated with boreal bryophytes in Alberta, Canada, an isolate of Coniochaeta velutina (Coniochaetaceae, Coniochaetales), an opportunistic tree-pathogen and saprobe, was obtained from Hylocomium splendens (Hedw.) Schimp. (Hylocomiaceae, Hypnales). This isolate exhibited phylogenetic affinities to C.velutina isolated from vascular plants. In vitro characterization of its interactions with the model host Funaria hygrometrica Hedw. (Funariaceae, Funariales) demonstrated that it readily forms both anamorph and teleomorph states on the moss. Infected hosts exhibited no macroscopic symptoms or, occasionally, became weakly chlorotic, suggesting that the fungus is a parasite. However, cellulase...
thumbnail
Viral erythrocytic necrosis (VEN) is a disease of marine and anadromous fishes, which is poorly understood, largely because its causative iridovirus, erythrocytic necrosis virus (ENV), is intractable to cell culture. Natural VEN epizootics and observations studies in wild populations suggest that temperature may be an important disease cofactor. Here, a controlled laboratory exposure study provides evidence for a direct relationship between temperature and the progression of viral erythrocytic necrosis (VEN) in Pacific herring. Waterborne exposure of Pacific herring to kidney homogenates containing ENV resulted in the establishment of infections, characterized by high infection prevalence (89%; 40/45) and mean viral...
    map background search result map search result map Phytophthora ramorum (sudden oak death pathogen) in Oregon Forests Percent of Tree Basal Area at Risk of Forest Pathogens Survival and viral load of chinook salmon, sockeye salmon, and steelhead trout exposed to 4 genogroups of infectious hematopoietic necrosis virus (IHNV) Infection prevalence and viral load in pacific herring exposed to erythrocytic necrosis virus (ENV) at 3 temperatures Infection prevalence and viral load in pacific herring exposed to erythrocytic necrosis virus (ENV) at 3 temperatures Survival and viral load of chinook salmon, sockeye salmon, and steelhead trout exposed to 4 genogroups of infectious hematopoietic necrosis virus (IHNV) Phytophthora ramorum (sudden oak death pathogen) in Oregon Forests Percent of Tree Basal Area at Risk of Forest Pathogens