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Related Concept Videos

Bacterial Phylum Spirochaetes01:30

Bacterial Phylum Spirochaetes

336
Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
336

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Vector-Borne Pathogens in Ectoparasites Collected from High-Elevation Pika Populations.

R Jory Brinkerhoff1,2, Hilary S Rinsland3, Shingo Sato4

  • 1Department of Biology, University of Richmond, Richmond, VA, USA. jbrinker@richmond.edu.

Ecohealth
|November 17, 2020
PubMed
Summary

Rodent-associated bacteria, Bartonella, were found in American pika fleas, suggesting a potential disease risk for pikas already threatened by climate change. This pathogen spillover could worsen pika population declines.

Keywords:
BartonellaClimate changeDisease ecologyPlaguePopulation declineSpilloverVector-borne disease

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Area of Science:

  • Ecology
  • Microbiology
  • Conservation Biology

Background:

  • American pikas face population declines due to climate change impacting their habitat.
  • Disease spillover from other mammals may pose an additional threat to pika populations.

Purpose of the Study:

  • To investigate the presence of rodent-associated bacterial pathogens in American pika fleas.
  • To test the hypothesis that pathogen exchange occurs between rodents and pikas via fleas.

Main Methods:

  • Collected fleas from 74 American pikas across various elevations in Colorado and Montana.
  • Screened flea DNA for bacterial pathogens, specifically Bartonella species and Yersinia pestis, using molecular methods.
  • Analyzed pathogen prevalence in relation to elevation and identified bacterial species.

Main Results:

  • Bartonella DNA was detected in 5.5% of the 275 sampled pika fleas.
  • Bartonella infection prevalence in fleas was not correlated with elevation.
  • DNA sequences were most similar to Bartonella grahamii, a known rodent-associated bacterium; Yersinia pestis was not detected.

Conclusions:

  • Evidence suggests rodent-associated bacteria can be present in pika fleas.
  • Pikas may acquire flea-borne pathogens from rodents, potentially increasing their vulnerability.
  • Pathogen spillover presents an additional stressor that could exacerbate climate change-driven pika declines.