Correlation of antigen specific IgG and IgG(T) responses with Anoplocephala perfoliata infection intensity in the horse.

The research article focuses on the relationship between specific immune responses in horses and the severity of infection by a parasitic intestinal worm, Anoplocephala perfoliata. The researchers purified a specific protein and used it to develop a test that could predict the level of infection in the animal based on the measurement of antibody levels in the blood.

Introduction and Objectives

• The research seeks to develop more accurate methods for diagnosing and quantifying infection levels of the intestinal parasite Anoplocephala perfoliata in horses. This parasite is associated with cases of colic, one of the leading causes of mortality in horses.
• The focus of the study is to determine the correlation between specific immune responses (IgG and IgG(T)) in horses and the severity of the parasitic infection.

Methods

• The team used affinity purification to isolate a doublet protein from the parasite’s secretory products and used it for enzyme-linked immunosorbent assays (ELISAs).
• Following that, they examined the connection between anti-12/13 kDa IgG and IgG(T) and the parasite burden in 94 horses with confirmed tapeworm infection levels.
• The researchers also examined how the anti-12/13 kDa IgG(T) levels changed in four horses after the elimination of A. perfoliata infection.
• The specificity of the anti-12/13 kDa IgG(T) ELISA was tested with serum samples from horses infected with other helminths but not A. perfoliata.
• Immunoblotting studies were performed to verify the lack of cross-reactivity between the isolated 12/13 kDa antigen and proteins from other helminth pathogens.

Findings

• The results showed that the levels of anti-12/13 kDa IgG and IgG(T) antibodies correlated with infection intensity, providing coefficients of 0.56 and 0.63 respectively. This means that higher levels of these antibodies are associated with more severe infection.
• Linear regression analysis highlighted that anti-12/13 kDa IgG(T) was the most reliable indicator of infection intensity.
• The study also confirmed that anti-12/13 kDa IgG(T) levels decreased in horses once the A. perfoliata infection was removed, showing that the response is specific to the infection status.
• The anti-12/13 kDa IgG(T) ELISA did not react with sera from horses infected with other kinds of helminths, suggesting high specificity and no cross-reactivity.

Conclusion

• In conclusion, the measurement of anti-12/13 kDa IgG(T) can provide a valuable tool for both clinical diagnosis and epidemiological studies involving the A. perfoliata infection in horses.