A guinea pig model for Lyme disease

Area of Science:

• Veterinary Infectious Diseases
• Bacteriology
• Immunology

Background:

• Borrelia burgdorferi is the causative agent of Lyme disease.
• Understanding host-pathogen interactions is crucial for developing effective treatments and prevention strategies.

Purpose of the Study:

• To investigate the susceptibility of outbred Hartley guinea pigs to Borrelia burgdorferi infection.
• To characterize the dissemination and persistence of Borrelia burgdorferi in guinea pigs.
• To evaluate the guinea pig as a model for studying Lyme disease.

Main Methods:

• Inoculation of guinea pigs of different age groups with Borrelia burgdorferi.
• Bacteriological culture for spirochete recovery from various tissues.
• Histopathological examination of infected tissues.
• Western immunoblot analysis to detect host immune response.

Main Results:

• Young guinea pigs (< or = 3 months) were highly susceptible (95%), while older guinea pigs (> or = 6 months) were resistant.
• Borrelia burgdorferi disseminated widely, with high recovery rates from bladders, knee joints, hearts, spleens, and spinal cords.
• Histopathological changes were observed in the heart and bladder, with some involvement in spinal cords and knee joints.
• A significant immunoglobulin G response was detected against specific Borrelia burgdorferi antigens.
• Infection was cleared from most tissues over time, except for persistent infection in knee joints (90% positive at > or = 8 weeks).

Conclusions:

• Outbred Hartley guinea pigs, particularly younger ones, are a suitable animal model for Borrelia burgdorferi infection.
• The model allows for the study of host-spirochete interactions and the pathogenesis of Lyme disease.
• Persistent infection in knee joints highlights a key aspect of Lyme disease that can be studied in this model.