Parasites, Hosts and Diseases

"Saeedeh Shojaee"

Original Article

Serologic Tests of IgG and IgM Antibodies and IgG Avidity for Diagnosis of Ocular Toxoplasmosis: Bahman Rahimi-Esboei, Mohammad Zarei, Mehdi Mohebali, Hossein Keshavarz Valian, Saeedeh Shojaee, Raziyeh Mahmoudzadeh, Mirataollah Salabati; Korean J Parasitol 2018;56(2):147-152.
Published online April 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.2.147

Abstract
PDF

This prospective study was aimed to detect acute and chronic ocular toxoplasmosis by comparison of anti-Toxoplasma gondii IgM and IgG antibody levels and IgG avidity test. One hundred and seventeen patients with ocular toxoplasmosis (OT) who referred to the Farabi Eye Hospital, Tehran, Iran were included in this study. Of the patients, 77 cases were positive for anti-T. gondii IgG, and 8 cases were positive for anti-T. gondii IgM. IgG avidity test revealed 11, 4, and 102 cases were low, intermediate, and high, respectively, and 6.8% and 9.4% of cases were positive for IgM and IgG avidity tests, respectively (P=0.632). Agreement (Kappa value) between paired tests IgG-IgM, IgG-IgG avidity, and IgM-IgG avidity was 0.080, 0.099, and 0.721, respectively (P<0.05). This study showed that conventional serologic tests (IgM and IgG levels) and IgG avidity correlate well each other and can be used to differentiate recent infections from old OT. It seems that reactivated old infections rather than recently acquired infections are majority of Iranian OT patients.

Citations

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Serum Concentrations of Th1, Th2 and Treg‐Associated Cytokines in Patients With Ocular Toxoplasmosis
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Parasite Immunology.2025;[Epub] CrossRef
Identification of novel biomarkers for anti-Toxoplasma gondii IgM detection and the potential application in rapid diagnostic fluorescent tests
Minh-Ngoc Nguyen, Seon-Ju Yeo, Hyun Park
Frontiers in Microbiology.2024;[Epub] CrossRef
Role of IgG avidity in eyes with active Toxoplasma retinochoroiditis
Pratik Lakhmawar, Anup Kelgaonkar, Anamika Patel, Ashish Khalsa, Soumyava Basu
Indian Journal of Ophthalmology.2024; 72(Suppl 4): S601. CrossRef
Efficacy of amniotic fluid, blood and urine samples for the diagnosis of toxoplasmosis in pregnant women candidates for amniocentesis using serological and molecular techniques
Rohallah Abedian, Bahman Rahimi Esboei, Shirafkan Kordi, Hadi Shokrollahnia Roshan, Hajar Ziaei Hezarjaribi, Zahra Rahmani, Mahbobeh Montazeri, Mahdi Fakhar
BMC Pregnancy and Childbirth.2024;[Epub] CrossRef
Clinical and Serological Characteristics of Ocular Toxoplasmosis in the Democratic Republic of Congo
Nadine Nsiangani Lusambo, Dieudonné Kaimbo Wa Kaimbo, Dieudonné Mumba Ngoyi, Janvier Kilangalanga Ngoy, Marie-Thérèse Ngoyi Bambi, Théodore Kadima Mutombo, Guy Kintoki Makela, Lady Ngandowe Nzamokili, Alejandra de-la-Torre
Ocular Immunology and Inflammation.2023; 31(7): 1522. CrossRef
The infectious status of patients with optic neuritis of inflammatory and demyelinating etiologies
V. V. Neroev, E. K. Eliseeva, G. I. Krichevskaya, G. A. Davydova, M. N. Zakharova
Russian Ophthalmological Journal.2023; 16(3): 54. CrossRef
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Silvia Fabiani, Claudio Caroselli, Martina Menchini, Giovanna Gabbriellini, Marco Falcone, Fabrizio Bruschi
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Zen Kuang Tham, Pooi Wah Lott, Chye Li Ee, Norlina Ramli, Tajunisah Iqbal
Infectious Diseases in Clinical Practice.2022;[Epub] CrossRef
Utility of blood as the clinical specimen for the diagnosis of ocular toxoplasmosis using uracil DNA glycosylase-supplemented loop-mediated isothermal amplification and real-time polymerase chain reaction assays based on REP-529 sequence and B1 gene
Bahman Rahimi Esboei, Shirzad Fallahi, Mohammad Zarei, Bahram Kazemi, Mehdi Mohebali, Saeedeh Shojaee, Parisa Mousavi, Aref Teimouri, Raziyeh Mahmoudzadeh, Mirataollah Salabati, Hossein Keshavarz Valian
BMC Infectious Diseases.2022;[Epub] CrossRef
Ocular toxoplasmosis: phenotype differences between toxoplasma IgM positive and IgM negative patients in a large cohort
Sofia Ajamil-Rodanes, Joshua Luis, Rabia Bourkiza, Benedict Girling, Angela Rees, Catherine Cosgrove, Carlos Pavesio, Mark Westcott
British Journal of Ophthalmology.2021; 105(2): 210. CrossRef
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Jasem Saki, Elham Eskandari, Mostafa Feghhi
International Ophthalmology.2020; 40(9): 2151. CrossRef
Duffy blood group system and ocular toxoplasmosis
Ana Iara Costa Ferreira, Cinara Cássia Brandão de Mattos, Fábio Batista Frederico, Cássia Rúbia Bernardo, Gildásio Castelo de Almeida Junior, Rubens Camargo Siqueira, Cristina Silva Meira-Strejevitch, Vera Lucia Pereira-Chioccola, Luiz Carlos de Mattos
Infection, Genetics and Evolution.2020; 85: 104430. CrossRef
Genotyping and phylogenic study of Acanthamoeba isolates from human keratitis and swimming pool water samples in Iran
Bahman Rahimi Esboei, Mahdi Fakhar, Reza Saberi, Mohammad Barati, Masoumeh Moslemi, Hadi Hassannia, Yousef Dadimoghadam, Nahid Jalallou
Parasite Epidemiology and Control.2020; 11: e00164. CrossRef
Diagnostic significance of C-reactive protein and hematological parameters in acute toxoplasmosis
Vanessa Sandri, Itamar Luís Gonçalves, Gustavo Machado das Neves, Marisa Lucia Romani Paraboni
Journal of Parasitic Diseases.2020; 44(4): 785. CrossRef
Evaluation of RE and B1 Genes as Targets for Detection of Toxoplasma gondii by Nested PCR in Blood Samples of Patients with Ocular Toxoplasmosis
Bahman Rahimi Esboei, Bahram Kazemi, Mohammad Zarei, Mehdi Mohebali, Hossein Keshavarz Valian, Saeedeh Shojaee, Fatemeh Zahedipour, Shirzad Fallahi, Parisa Mousavi, Raziyeh Mahmoudzadeh, Mirataollah Salabati
Acta Parasitologica.2019; 64(2): 384. CrossRef

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Brief Communication

Production and Evaluation of Toxoplasma gondii Recombinant GRA7 for Serodiagnosis of Human Infections: Mina Selseleh, Hossein Keshavarz, Mehdi Mohebali, Saeedeh Shojaee, Monavar Selseleh, Mohammad Reza Eshragian, Fatemeh Mansouri, Mohammad Hossein Modarressi; Korean J Parasitol 2012;50(3):233-238.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.233

Abstract
PDF

The precise diagnosis of the acute toxoplasmosis in pregnant women and immunocompromsied patients has critical importance. Most of the commercially available assays use the whole Toxoplasma soluble extract as the antigen. However, the assays currently available for the detection of specific anti-Toxoplasma antibodies may vary in their abilities to detect serum immunoglobulins, due to the lack of a purified standardized antigen. The aim of this study was production and evaluation of the usefulness of the recombinant Toxoplasma gondii GRA7 antigen for the serodiagnosis of Toxoplasma gondii IgM and IgG by ELISA. A total of 70 T. gondii IgM positive sera, 74 T. gondii IgG positive sera, and 60 sera from subjects who were not infected with T. gondii were examined. These sera were shown different absorbance values in ELISA test. To control the specificity of the rGRA7 other parasitic diseases, for example, echinococcosis, malaria, leishmaniasis, fascioliasis, and strongyloidiasis were tested of which none showed positive results. Sensitivity and specificity of the generated recombinant IgG ELISA in comparison with commercial ELISA (com ELISA) were 89% and 90%, and the sensitivity and specificity of the generated recombinant IgM ELISA were 96% and 90%, respectively. The results obtained here show that this antigen is useful for diagnostic purposes.

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Bahman Rahimi Esboei, Shirzad Fallahi, Mohammad Zarei, Bahram Kazemi, Mehdi Mohebali, Saeedeh Shojaee, Parisa Mousavi, Aref Teimouri, Raziyeh Mahmoudzadeh, Mirataollah Salabati, Hossein Keshavarz Valian
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Detection of toxoplasma-specific immunoglobulin G in human sera: performance comparison of in house Dot-ELISA with ECLIA and ELISA
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Original Articles

Real-Time RT-PCR on SAG1 and BAG1 Gene Expression during Stage Conversion in Immunosuppressed Mice Infected with Toxoplasma gondii Tehran Strain: Monavar Selseleh, Mohammad Hossein Modarressi, Mehdi Mohebali, Saeedeh Shojaee, Mohammad Reza Eshragian, Mina Selseleh, Ebrahim Azizi, Hossein Keshavarz; Korean J Parasitol 2012;50(3):199-205.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.199

Abstract
PDF

Toxoplasmic encephalitis is caused by reactivation of bradyzoites to rapidly dividing tachyzoites of the apicomplexan parasite Toxoplasma gondii in immunocompromised hosts. Diagnosis of this life-threatening disease is problematic, because it is difficult to discriminate between these 2 stages. Toxoplasma PCR assays using gDNA as a template have been unable to discriminate between an increase or decrease in SAG1 and BAG1 expression between the active tachyzoite stage and the latent bradyzoite stage. In the present study, real-time RT-PCR assay was used to detect the expression of bradyzoite (BAG1)- and tachyzoite-specific genes (SAG1) during bradyzoite/tachyzoite stage conversion in mice infected with T. gondii Tehran strain after dexamethasone sodium phosphate (DXM) administration. The conversion reaction was observed in the lungs and brain tissues of experimental mice, indicated by SAG1 expression at day 6 after DXM administration, and continued until day 14. Bradyzoites were also detected in both organs throughout the study; however, it decreased at day 14 significantly. It is suggested that during the reactivation period, bradyzoites not only escape from the cysts and reinvade neighboring cells as tachyzoites, but also converted to new bradyzoites. In summary, the real-time RT-PCR assay provided a reliable, fast, and quantitative way of detecting T. gondii reactivation in an animal model. Thus, this method may be useful for diagnosing stage conversion in clinical specimens of immunocompromised patients (HIV or transplant patients) for early identification of tachyzoite-bradyzoite stage conversion.

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IgG Avidity ELISA Test for Diagnosis of Acute Toxoplasmosis in Humans: Amir Hossien Rahbari, Hossien Keshavarz, Saeedeh Shojaee, Mehdi Mohebali, Mostafa Rezaeian; Korean J Parasitol 2012;50(2):99-102.
Published online May 24, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.2.99

Abstract
PDF

Serum samples, 100 in the total number, were collected from different laboratories in Tehran, Iran and tested for anti-Toxoplasma specific IgG and IgM antibodies using indirect immunofluorescent antibody test (IFAT). Using the IgG (chronic) and IgM (acute) positive samples, the IgG avidity test was performed by ELISA in duplicate rows of 96-well microtiter plates. One row was washed with 6 M urea and the other with PBS (pH 7.2), then the avidity index (AI) was calculated. Sixteen out of 18 (88.9%) sera with acute toxoplasmosis showed low avidity levels (AI≤50), and 76 out of 82 (92.7%) sera in chronic phase of infection showed high avidity index (AI>60). Six sera had borderline ranges of AI. The results showed that the IgG avidity test by ELISA could distinguish the acute and chronic stages of toxoplasmosis in humans.

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Serologic Tests of IgG and IgM Antibodies and IgG Avidity for Diagnosis of Ocular Toxoplasmosis
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