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Cryptosporidium rubeyi n. sp. (Apicomplexa: Cryptosporidiidae) in multiple Spermophilus ground squirrel species

Xunde Li1, Maria das Graças Cabral Pereira2, Royce Larsen3

  • 1Department of Population Health and Reproduction, School of Veterinary Medicine, USA ; Western Institute for Food Safety and Security, University of California, Davis 95616, USA.

International Journal for Parasitology. Parasites and Wildlife
|November 7, 2015
PubMed

Insights

A novel Cryptosporidium species, Cryptosporidium rubeyi, was identified in California ground squirrels. This parasite

Area of Science:

  • Veterinary Parasitology
  • Molecular Biology
  • Microbiology

Background:

  • Previous reports identified a unique Cryptosporidium sp.
  • c
  • genotype in California ground squirrels.

Purpose of the Study:

  • To characterize the morphology and infectivity of the
  • c
  • -genotype to propose it as a new species.

Main Methods:

  • Sequencing of 18S rRNA, actin, and HSP70 genes.
  • Phylogenetic and BLAST analysis.
  • Morphological characterization of oocysts.
  • Animal infectivity studies in mice and calves.

Main Results:

  • Confirmation of the unique Sbey-c genotype in Spermophilus beecheyi.
  • Phylogenetic analysis showing distinctness from known Cryptosporidium species.
  • Proposed naming of the new species as Cryptosporidium rubeyi n. sp.
  • Mean oocyst size: 4.67 × 4.34 μm; length/width index: 1.08.
  • Cryptosporidium rubeyi n. sp. oocysts were not infectious to BALB/c mice or Holstein calves.

Conclusions:

  • The
  • c
  • -genotype from ground squirrels represents a distinct species, Cryptosporidium rubeyi n. sp.
  • This finding expands the known host range and diversity of Cryptosporidium parasites.
  • The lack of infectivity in laboratory models suggests host specificity.
Keywords:
CryptosporidiumGenotypesGround squirrelsProtozoaS. beecheyiSpermophilus

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