Comparison of the Toxogen® rapid test with ELISA immunoenzymatic technique for toxoplasmosis serology in pregnant women

Authors

1. Francine Isabelle Rakotonindrina
   Laboratory of the Professor Zafisaona Gabriel (PZaGa) University Hospital Center- Faculty of Medicine, University of Mahajanga, Madagascar.
   https://orcid.org/0000-0002-7608-8219
2. Rakotomalala Rivo S
   Laboratory of the Professor Zafisaona Gabriel (PZaGa) University Hospital Center- Faculty of Medicine, University of Mahajanga, Madagascar.
3. Tsatoromila Fenosoa A
   Directorate of Blood Transfusion - Faculty of Medicine, University of Antananarivo.
4. Rabenandrianina Tahirimalala
   Laboratory of the Professor Zafisaona Gabriel (PZaGa) University Hospital Center- Faculty of Medicine, University of Mahajanga, Madagascar.
5. Rajaonatahina Davidra
   Paraclinical Training and Research Unit in Immunology - Faculty of Medicine, 
 University of Antananarivo.
6. Rakotovao Luc A
   CHU / JRB Laboratory - Faculty of Medicine, University of Antananarivo.
7. Rakoto Alson Olivat A
   CHU / JRB Laboratory - Faculty of Medicine, University of Antananarivo.
8. Rasamindrakotroka Andry
   Laboratory for Training and Research in Medical Biology, Faculty of Medicine, University of Antananarivo.
9. Randriamanantany Zely
   Directorate of Blood Transfusion - Faculty of Medicine, University of Antananarivo.
10. Razanakolona Lala R S
    National Reference Laboratory for HIV / AIDS and Sexually Transmitted Infections - Ministry of Public Health - Faculty of Medicine, University of Antananarivo.

Abstract

The aim of this study was to compare the technical performance of the Toxogen® rapid test against the ELISA technique for serological screening and/or serological monitoring of toxoplasmosis in pregnant women. Methods and material: A prospective, descriptive and analytical study was conducted over a period of 7 months from January to July 2018. One hundred and eighty-two toxoplasmosis serologies were carried out on 144 pregnant women followed in two hospitals in Mahajanga and in a private laboratory in Antananarivo. Two serologies were performed for each case, the first by the rapid test Toxogen®, a latex agglutination test, and the second by the IgG-ELISA and IgM-ELISA technique. Results: The Toxogen® rapid test had a sensitivity of 62.5%, a specificity of 97.1%, a Positive Predictive Value of 94.3%, a Negative Predictive Value of 76.7% compared to the IgG-ELISA technique. The correlation between the dilution titer by the Toxogen® rapid test and the optical density (OD) of anti-toxoplasmics IgG by the ELISA technique was very low (r² = 0.17, p <0.001). The crude prevalence of toxoplasmosis was 30,6% (n=44) by the Toxogen® rapid test and 46.5% (n=67) by the IgG-ELISA technique, the difference was significant (p <0.001). We had 2 cases (0.01%) positives by the IgM-ELISA which were not detected by the Toxogen® rapid test. Conclusion: The Toxogen® rapid test cannot substitute the ELISA technique for the serological screening and/or serological monitoring of toxoplasmosis in pregnant women. Keywords : ELISA; pregnant women; latex agglutination test; serology; toxoplasmosis.

Keywords

ELISA; pregnant women; latex agglutination test; serology; toxoplasmosis

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