Antigenic variation in Trypanosoma evansi: variable antigen type development in mice, sheep and goats

Area of Science:

• Parasitology
• Immunology
• Veterinary Science

Background:

• Trypanosoma evansi causes significant disease in livestock and animals.
• Understanding the variation in Variable Antigen Types (VATs) is crucial for disease control and diagnosis.
• Previous studies on VAT development have primarily focused on rabbits.

Purpose of the Study:

• To investigate the early development of VATs in Trypanosoma evansi.
• To compare VAT development across different host species: mice, sheep, and goats.
• To identify predominant VATs for potential use in serodeme analysis.

Main Methods:

• Infection of mice, sheep, and goats with a stock of Trypanosoma evansi.
• Monitoring and analysis of VATs present during early stages of infection.
• Isolation and characterization of VATs from relapse populations in mice.

Main Results:

• Host species did not significantly influence the range of VATs detected early in infection.
• Differences in VAT composition were observed among individual trypanosome populations from different hosts.
• Ten previously identified predominant VATs in rabbits were also predominant in sheep and goats.
• These ten VATs were also present in first relapse populations from mice.

Conclusions:

• Early VAT development in Trypanosoma evansi is broadly conserved across different mammalian hosts.
• Relapse populations in mice can serve as a valuable source for identifying predominant VATs.
• Predominant VATs identified in this study hold potential for serodeme analysis of Trypanosoma evansi stocks.