Spiroplasma as a candidate agent for the transmissible spongiform encephalopathies

Area of Science:

• Veterinary Neurology
• Infectious Diseases
• Microbiology

Background:

• Transmissible spongiform encephalopathies (TSEs) are fatal neurodegenerative diseases affecting various animal species and humans.
• Diseases include scrapie in sheep, chronic wasting disease in cervids, and Creutzfeldt-Jakob disease in humans.
• The etiology of TSEs remains a subject of intense research and debate.

Purpose of the Study:

• To review and synthesize evidence supporting the hypothesis that Spiroplasma infection is involved in the pathogenesis of TSEs.
• To evaluate the role of a novel Spiroplasma species in the context of an epidemiologic infection model for TSEs.
• To address the potential of Spiroplasma as the causal agent of TSEs.

Main Methods:

• Review of accumulated evidence over 30 years regarding Spiroplasma infection and TSEs.
• Analysis of data within an established epidemiologic infection model.
• Consideration of Koch's postulates in relation to Spiroplasma and TSEs.

Main Results:

• A novel Spiroplasma species was successfully isolated from brain tissues of sheep with scrapie, cervids with chronic wasting disease, and patients with Creutzfeldt-Jakob disease.
• Evidence suggests a consistent involvement of Spiroplasma infection in TSE cases across different species.
• The findings support the hypothesis linking Spiroplasma sp. to the development of TSEs.

Conclusions:

• The recovery of Spiroplasma sp. from TSE-affected hosts raises significant questions about its role in disease causation.
• Accumulated evidence supports the hypothesis that Spiroplasma sp. is the causal agent of TSEs.
• Fulfillment of Koch's postulates is necessary to definitively establish Spiroplasma as the causative agent of TSEs.