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New insight into the diagnostic cut-off value of serum anti-Toxocara IgG for ocular toxocariasis in uveitis patients

Published online by Cambridge University Press:  20 November 2018

N.F. Abd El-Aal Open the ORCID record for N.F. Abd El-Aal [Opens in a new window] ,
M.A.A. Basha  and
A.M. Eid
N.F. Abd El-Aal*
Affiliation:
Department of Medical Parasitology, Faculty of Medicine, Zagazig University, Egypt
M.A.A. Basha
Affiliation:
Department of Radiology, Faculty of Medicine, Zagazig University, Egypt
A.M. Eid
Affiliation:
Department of Ophthalmology, Faculty of Medicine, Zagazig University, Egypt
*
Author for correspondence: N.F. Abd El-Aal E-mail: naglaa_fathy220@yahoo.com
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Abstract

Uveitis is one of the commonest causes of vision loss worldwide and its exact etiology is still not clarified in most patients. The current study is a trial to assess the efficacy of serum anti-Toxocara immunoglobulin G (IgG) by enzyme-linked immunosorbent assay (ELISA) as a diagnostic tool for ocular toxocariasis (OT) and to detect OT prevalence and the associated ocular manifestations in sera of patients with uveitis. One hundred and twelve patients (62 females and 50 males) with uveitis were diagnosed by ophthalmologists, radiologists and rheumatologists according to ocular manifestations, laboratory and radiological investigations. Serum anti-Toxocara IgG titers were determined by ELISA in sera of all patients. Our results revealed that OT is highly associated with intermediate and posterior uveitis. Children and young adult females, especially those residing in rural areas, complained mainly of diminution of vision in the left eye, with strabismus and leukocoria. At a cut-off value of 0.258, the sensitivity and specificity of IgG ELISA were 93.3% and 100%, respectively. In conclusion, at a novel cut-off value of 0.258 the serum anti-Toxocara IgG ELISA is predicted to be a diagnostic tool for OT regarding sensitivity and specificity. Also, it has potential importance in the interpretation and differential diagnosis of OT. Thus, serum anti-Toxocara IgG ELISA should be a routine test for screening of suspected cases.

Keywords

ELISAocularseroprevalencetoxocariasisuveitis
Type
Research Paper
Information
Journal of Helminthology , Volume 94 , 2020 , e12
Copyright
Copyright © Cambridge University Press 2018 

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