Toxocariasis: serological diagnosis by enzyme immunoassay

Area of Science:

• Immunology
• Parasitology
• Diagnostic Development

Background:

• Toxocariasis is a parasitic infection caused by Toxocara species.
• Accurate serodiagnostic methods are crucial for identifying toxocariasis.
• Existing methods may lack sufficient sensitivity or specificity for widespread use.

Purpose of the Study:

• To develop and evaluate a novel enzyme-immunoassay (EIA) for detecting serum antibodies against secretory antigens of migrating toxocara larvae.
• To assess the diagnostic performance of the EIA in distinguishing toxocariasis from other conditions.

Main Methods:

• Development of an enzyme-immunoassay (EIA) targeting secretory antigens of Toxocara larvae.
• Testing of serum samples from healthy UK adults (n=922), patients with non-toxocaral helminthic infections (n=62), and patients with clinical toxocariasis (n=13).
• Statistical analysis to compare antibody levels across different groups.

Main Results:

• 2.6% of healthy adults had elevated specific antibody levels, with higher prevalence in males.
• Patients with non-toxocaral helminthic infections showed antibody levels comparable to healthy controls.
• All patients with clinical toxocariasis exhibited significantly elevated antibody levels (p < 0.001) compared to both control groups.

Conclusions:

• The developed toxocariasis enzyme-immunoassay demonstrates high sensitivity and specificity.
• This EIA is a valuable tool for immunodiagnostic applications and large-scale seroepidemiological surveys.
• The test effectively differentiates toxocariasis from other helminthic infections.