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Related Experiment Videos

SCID mouse model for lethal Q fever.

Masako Andoh1, Takashi Naganawa, Akitoyo Hotta

  • 1Department of Veterinary Microbiology, Faculty of Agriculture, Gifu University, 1-1 Yanagido, Gifu, Gifu 501-1193, Japan.

Infection and Immunity
|July 23, 2003
PubMed
Summary

Severe combined immunodeficient (SCID) mice develop severe Q fever endocarditis, unlike immunocompetent mice. This new animal model shows promise for studying Coxiella burnetii infections in humans.

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Area of Science:

  • Infectious Diseases
  • Immunology
  • Veterinary Medicine

Background:

  • Q fever is a global zoonosis caused by Coxiella burnetii.
  • Endocarditis is the most severe human complication of Q fever.
  • Existing animal models do not adequately replicate Q fever endocarditis.

Purpose of the Study:

  • To establish a suitable experimental animal model for Q fever endocarditis.
  • To investigate the role of host immunodeficiency in Q fever severity.
  • To provide a tool for studying chronic Q fever.

Main Methods:

  • Infection of severe combined immunodeficient (SCID) mice and immunocompetent mice with Coxiella burnetii.
  • Observation of clinical symptoms, survival rates, and pathological lesions.

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  • Determination of the 50% lethal dose (LD50) of C. burnetii in both mouse models.

    • Main Results:

    • SCID mice exhibited persistent symptoms and mortality, while immunocompetent mice survived and recovered.
    • SCID mice developed severe chronic lesions in multiple organs, including the heart, lungs, spleen, liver, and kidneys.
    • Heart lesions in SCID mice mimicked human Q fever endocarditis, with calcification and infected macrophages.
    • The LD50 of C. burnetii was significantly lower (at least 10^8 times) in SCID mice compared to immunocompetent mice.

    Conclusions:

    • SCID mice are highly susceptible to C. burnetii, establishing a relevant model for Q fever endocarditis.
    • Host immunodeficiency exacerbates Q fever, highlighting its importance in disease pathogenesis.
    • This SCID mouse model offers a valuable new tool for researching chronic Q fever and infections in immunocompromised individuals.