Spirochaetes in the equine caecum

Area of Science:

• Veterinary Microbiology
• Equine Health
• Microbial Ecology

Background:

• The horse caecum harbors a complex microbial community, including spirochaetes.
• Understanding the morphology and interactions of these microorganisms is crucial for equine gastrointestinal health.

Purpose of the Study:

• To characterize the morphological types of spirochaetes present in the horse caecum.
• To investigate the viability of these spirochaetes through culturing attempts.
• To identify potential interactions, such as viral infections, affecting the spirochaetes.

Main Methods:

• Morphological analysis of spirochaetes using microscopy.
• In vitro culturing techniques to assess organism viability.
• Electron microscopy to examine ultrastructural details and identify viral presence.

Main Results:

• Two distinct spirochaete morphological types were identified, differing in size and shape.
• Culturing attempts were unsuccessful, with no organisms surviving beyond primary isolation.
• Electron microscopy revealed a significant prevalence of bacteriophage infections within the observed spirochaetes.

Conclusions:

• The horse caecum hosts morphologically diverse spirochaetes.
• Spirochaete viability in vitro is limited, suggesting specific in vivo requirements or susceptibility to environmental factors.
• Bacteriophage infection is a notable factor potentially influencing spirochaete populations and survival in the equine gut.