Toxoplasma gondii detection by nested polymerase chain reaction in lens aspirate and peripheral blood leukocyte in congenital cataract patients: the first report from a tertiary eye hospital in India.
ABSTRACT To detect T. gondii DNA and specific antibodies in lens aspirates (LA) and peripheral blood leucocytes (PBL) of congenital cataract patients.
ELISA for T. gondii antibodies on sera nPCR for T. gondii DNA (B1 gene) on LA and PBL were performed for 52 patients.
T. gondii DNA was detected in 29 (55.8%) of the 52 patients (LA-14, PBL-13, LA and PBL-2, and specific IgM in 2 sera). nPCR in PBL was more sensitive than ELISA (p<0.005).
nPCR is a sensitive technique to detect T. gondii from LA and PBL in congenital cataract patients.
- Ocular immunology and inflammation 08/2011; 19(5):363-6. · 0.72 Impact Factor
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ABSTRACT: We undertook this study to determine the infectious aetiology of congenital cataract based on the presence of IgM antibodies to TORCHES [(Toxoplasma gondii (T. gondii), Rubella virus (RV), Cytomegalovirus (CMV), Herpes simplex virus (HSV) and Syphilis (caused by Treponema pallidum)] in the serum samples of congenital cataract patients. Serum samples collected from 593 infants and children (10 days to 12 months old) with clinically diagnosed congenital cataract at Sankara Nethralaya, a referral eye hospital in Chennai, were tested for the presence of specific IgG and IgM antibodies to T. gondii, RV, CMV, HSV by ELISA and specific treponemal antibodies by T. pallidum haemagglutination test (TPHA). IgM antibodies were detected against T. gondii in 1.7 per cent, RV in 8.4 per cent, CMV in 17.8 per cent and HSV in 5.1 per cent, and that of specific IgG in 8.9, 25.0, 66.1 and 2.6 per cent respectively. Presence of IgM antibodies to T. Gondii in the study group was significantly lower when compared to IgM antibodies to RV, CMV and HSV. All serum samples were negative for the presence of anti treponemal antibodies by TPHA. Overall, IgM antibodies to one or more of the four infectious agents were detected in 20.2 per cent of the study population, and among these co-infections to more than one infectious agents were detected in 12.5 per cent. The results of the present retrospective analysis showed association of RV, CMV, HSV and T. gondii with congenital cataract based on the presence of specific IgM antibodies.The Indian Journal of Medical Research 04/2010; 131:559-64. · 1.66 Impact Factor
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ABSTRACT: PURPOSE: To report the clinical features of cataracts in eyes with ocular toxocariasis. SETTING: Department of Ophthalmology, Seoul National University Bundang Hosptal, Seongnam, South Korea. DESIGN: Retrospective observational case series. METHODS: The clinical diagnosis of ocular toxocariasis was based on the following characteristic features: retinal granuloma with or without ocular inflammation and positive results in serum antibody enzyme-linked immunosorbent assay. Patients younger than 60 years who presented with a unilateral cataract and were diagnosed with ocular toxocariasis between January 2009 and January 2012 were included. Demographic and ocular examination data for all patients showing atypical cataract features were collected. All cataracts were documented with anterior segment photography. RESULTS: Seven of 83 patients (8.4%) presented with an atypical cataract in the eye with ocular toxocariasis only. The mean patient age was 49.7 years ± 8.3 (SD) (range 38 to 59 years). All patients had small, round, white lens opacities resembling retinal granulomas. The granuloma-like opacities were located primarily in the lens midperiphery and in the subcapsular level. The lens opacity migrated in 1 patient. CONCLUSIONS: Ocular toxocariasis can cause a cataract with distinctive clinical features. These cataracts show a granuloma-like opacity primarily in the posterior subcapsular level; the opacity can migrate. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.Journal of Cataract and Refractive Surgery 03/2013; · 2.75 Impact Factor