Publications by authors named "Marcos Isidoro-Ayza"

The emergence of white-nose syndrome (WNS) in North America has resulted in mass mortalities of hibernating bats and total extirpation of local populations. The need to mitigate this disease has stirred a significant body of research to understand its pathogenesis. Pseudogymnoascus destructans, the causative agent of WNS, is a psychrophilic (cold-loving) fungus that resides within the class Leotiomycetes, which contains mainly plant pathogens and is unrelated to other consequential pathogens of animals.

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Millions of hibernating bats across North America have died from white-nose syndrome (WNS), an emerging disease caused by a psychrophilic (cold-loving) fungus, , that invades their skin. Mechanisms of invasion of bat epidermis remain obscure. Guided by our in vivo observations, we modeled hibernation with a newly generated little brown bat () keratinocyte cell line.

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The development of effective vaccines against fungal infections requires the induction of protective, pathogen-specific cell-mediated immune responses. Here, we asked whether combination adjuvants based on delta inulin (Advax) formulated with Toll-like receptor (TLR) agonists could improve vaccine protection mediated by a fungal recombinant protein, Bl-Eng2 (i.e.

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White-nose syndrome (WNS) caused by the fungus, Pseudogymnoascus destructans (Pd) has killed millions of North American hibernating bats. Currently, methods to prevent the disease are limited. We conducted two trials to assess potential WNS vaccine candidates in wild-caught Myotis lucifugus.

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Article Synopsis
  • Snake fungal disease, also known as ophidiomycosis, is a new infection affecting snake populations that remains poorly understood.
  • There is limited knowledge about how this fungus spreads and what it means for the conservation of wild snakes.
  • Recent findings indicate that the fungus may be transmitted from mother snakes to their offspring, suggesting a vertical transmission route.
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Severe Perkinsea infection (SPI) is an emerging disease of frogs responsible for mass mortalities of tadpoles across the United States. It is caused by protozoa belonging to the phylum Perkinsozoa that form a distinct group referred to as the Pathogenic Perkinsea Clade of frogs. In this work, we provide detailed description of gross and histologic lesions from 178 naturally infected tadpoles, including 10 species from 22 mortality events and 6 amphibian health monitoring studies from diverse geographic areas.

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We describe a die-off of little brown bats ( Myotis lucifugus carissima) associated with acute intoxication with microcystin-LR in 2016 at Scofield Reservoir in Utah, US. High levels of this cyanotoxin in water from the reservoir and gastrointestinal content of bats supported this diagnosis.

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We documented mortality of green frog ( Rana clamitans) tadpoles in Wisconsin, US, attributed to severe Perkinsea infection. Final diagnosis was determined by histopathology. followed by molecular detection of pathogenic Perkinsea clade (PPC) of frogs in the liver.

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Article Synopsis
  • Newcastle disease viruses (NDV), particularly a pigeon-adapted variant, pose significant risks to both wild birds and poultry, with limited genomic characterization in U.S. wild columbids.
  • The study analyzed formalin-fixed paraffin-embedded samples from wild pigeons, using next-generation sequencing (NGS) to identify NDV genomes, achieving high genome coverage and depth in positive cases.
  • Findings revealed the presence of two sub-genotypes of NDV (VIa and a novel VIn) as responsible for several pigeon mortality events in the U.S. between 2010 and 2016, linking their distribution to specific bird populations.
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During 2002-15 we examined the causes of mortality in a population of northern sea otters ( Enhydra lutris kenyoni). Beachcast sea otters were collected primarily from the US coast of Washington. Although there are no permanent sea otter residents in Oregon, several beachcast otters were collected from the Oregon coast.

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Emerging infectious diseases such as chytridiomycosis and ranavirus infections are important contributors to the worldwide decline of amphibian populations. We reviewed data on 247 anuran mortality events in 43 States of the United States from 1999-2015. Our findings suggest that a severe infectious disease of tadpoles caused by a protist belonging to the phylum Perkinsea might represent the third most common infectious disease of anurans after ranavirus infections and chytridiomycosis.

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Article Synopsis
  • Cunninghamella bertholletiae is a thermophilic species known for causing rare cases of mycoses, particularly in humans, but little is understood about its impact on animals, particularly cetaceans like dolphins.
  • This study focuses on the characterization of a C. bertholletiae isolate linked to a central nervous system mucormycosis case in a dolphin, utilizing morphological, physiological, and DNA sequencing techniques for identification.
  • The research confirmed the isolate's identity through DNA sequencing and found that it clusters closely with the C. bertholletiae neotype strain, although its specific sources of infection in cetaceans remain unclear and require further investigation.
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Liposarcomas are malignant tumors of adipocytes. The current report describes a liposarcoma in a 2.5-year-old, mixed-breed commercial sow that was detected during meat inspection.

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Background: Brucella ceti infections have been increasingly reported in cetaceans. Brucellosis in these animals is associated with meningoencephalitis, abortion, discospondylitis', subcutaneous abscesses, endometritis and other pathological conditions B. ceti infections have been frequently described in dolphins from both, the Atlantic and Pacific Oceans.

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In May 2012, an adult, male bottlenose dolphin (Tursiops truncatus) was found stranded and dead on the Spanish Mediterranean coast. At necropsy, several areas of malacia were macroscopically observed in the periventricular parenchyma of the cerebrum. Microscopically a severe, diffuse, pyogranulomatous, and necrotizing meningoencephalomyelitis was associated with numerous intralesional highly pleomorphic fungal structures.

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