ArticleParasitology research2014
Acanthamoeba DNA can be directly amplified from corneal scrapings.
Article in Parasitology research, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 13 citations in OpenAlex.
- Epidemiology of free-living amoebae infections in Africa: a review.Pathogens and global health · 2023Review
- The Autofluorescence Patterns ofPathogens (Basel, Switzerland) · 2021Article
- In vitro amoebicidal effect ofJournal of parasitic diseases : official organ of the Indian Society for Parasitology · 2021Article
- Colony-PCR Is a Rapid Method for DNA Amplification of Hyphomycetes.Journal of fungi (Basel, Switzerland) · 2016Article
- Diagnosis ofIranian journal of parasitologyArticle
- Article
- Bilateral Acanthamoeba Keratitis Secondary to Contaminated Contact Lens Suction Applicators: A Rare Case of Accessory-Mediated Transmission.Case reports in ophthalmologyArticle
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Authors and funding
5 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
This study evaluated the performance of direct amplification of Acanthamoeba-DNA bypassing DNA extraction in the diagnosis of Acanthamoeba keratitis in clinically suspected cases in comparison to direct microscopic examination and in vitro culture. Corneal scrapings were collected from 110 patients who were clinically suspected to have Acanthamoeba keratitis, 63 contact lens wearers (CLW), and 47 non-contact lens wearers (NCLW). Taken samples were subjected to direct microscopic examination, cultivation onto the non-nutrient agar plate surface seeded with Escherichia coli, and PCR amplification. The diagnostic performance of these methods was statistically compared. The results showed that Acanthamoeba infection was detected in 21 (19.1%) of clinically suspected cases (110); 17 (81%) of them were CLW and the remaining 4 (19%) positive cases were NCLW. Regarding the used diagnostic methods, it was found that direct amplification of Acanthamoeba DNA bypassing nucleic acid extraction was superior to microscopy and culture in which 21 cases (19.1%) were positive for Acanthamoeba by PCR compared to 19 positive cases by culture (17.3%) and one case (0.9%) by direct smear. The difference in detection rates between culture and direct smear was highly statistically significant (P = 0.001). On the other hand, there was no significant difference in detection rates between culture and PCR (P = 0.86). On using culture as the gold standard, PCR showed three false-positive samples that were negative by culture and one false-negative sample that was positive by culture. At the same time, direct smear showed 18 false-negative samples. The sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy of PCR were 94.7, 96.7, 85.7, 98.9, and 96.4, respectively, while those of direct smear were 5.3, 100, 100, 83.5, and 83.6, respectively. In conclusion, direct amplification of Acanthamoeba-DNA bypassing DNA extraction is a reliable, specific, sensitive method in the diagnosis of Acanthamoeba keratitis in clinically suspected cases. It should set up in ophthalmological centers as an easy diagnostic tool.
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