Evaluation of Loop-mediated Isothermal Amplification Assay for Rapid Diagnosis of Acanthamoeba Keratitis |
| |
Affiliation: | 2. Departments of Medical Parasitology, Chandigarh, India;1. Departments of Ophthalmology, Postgraduate Institute of Medical Education and Research, Chandigarh, India |
| |
Abstract: | Background: The clinical features of Acanthamoeba keratitis (AK) are non-specific and closely resemble bacterial, viral and fungal keratitis. Materials and Methods: We compared loop-mediated isothermal amplification (LAMP) with microscopy, non-nutrient agar (NNA) culture and polymerase chain reaction (PCR) in clinical suspects of AK. Results: Of 52 clinical samples (42 AK suspects and 10 proven bacterial, viral or fungal keratitis), 3 were positive by direct microscopy (sensitivity 60%, confidence interval [CI]: 17%–92.7%), and 5 by NNA culture, 18S rDNA PCR and LAMP (sensitivity 100%, CI: 46.3%–100%). The limit of detection of Acanthamoeba DNA was 1 pg/μl by both LAMP and PCR. Conclusion: PCR and LAMP assays targeting 18S rDNA gene were found particularly suitable for a rapid and accurate diagnosis of AK. LAMP assay takes 2–3 h lesser than PCR, and thus offers a rapid, highly sensitive and specific, simple and affordable diagnostic modality for patients suspected of AK, especially in resource limited settings |
| |
Keywords: | diagnosis free living amoebae keratitis loop-mediated isothermal amplification assay parasite polymerase chain reaction |
本文献已被 ScienceDirect 等数据库收录! |
|