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Anaplasma phagocytophilum from Rodents and Sheep, China

Lin Zhan1, Wu Chun Cao, Jia Fu Jiang

  • 1Beijing Institute of Microbiology and Epidemiology, Beijing, People's Republic of China.

Emerging Infectious Diseases
|April 23, 2010
PubMed

Insights

New Anaplasma phagocytophilum strains were identified in China from rodents and sheep. These novel strains, distinct from known global types, warrant further investigation into their public health and veterinary significance.

Area of Science:

  • Veterinary Microbiology
  • Infectious Diseases
  • Molecular Epidemiology

Background:

  • Anaplasma phagocytophilum is an important tick-borne bacterium affecting various animal species globally.
  • Understanding the genetic diversity of A. phagocytophilum is crucial for disease control and prevention.

Purpose of the Study:

  • To isolate and molecularly characterize Anaplasma phagocytophilum strains from wild and domestic animals in China.
  • To compare these novel Chinese isolates with known global strains of A. phagocytophilum.

Main Methods:

  • Isolation of A. phagocytophilum from rodents and sheep in northeastern China.
  • Propagation in BALB/c mice and HL60 cell culture.
  • Identification using Wright-Giemsa staining, immunofluorescence, and electron microscopy.
  • Molecular characterization through sequence analysis of 16S rRNA, citrate synthase, major surface protein 4, and heat shock protein genes.

Main Results:

  • Three distinct A. phagocytophilum strains were successfully isolated and cultured.
  • Sequence analyses revealed that the three isolates were genetically identical to each other.
  • These novel Chinese strains exhibited significant genetic differences compared to all previously identified strains from other countries.

Conclusions:

  • The study identified novel Anaplasma phagocytophilum strains in China.
  • These isolates represent a unique genetic lineage distinct from global counterparts.
  • Further research is necessary to determine the public health and veterinary implications of these newly identified strains.

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