Journals / Türkiye Parazitoloji Dergisi / 2009 / Cilt: 33 - Sayı: 2

The molecular diagnosis of cryptosporidiosis in fresh and formalin preserved fecal samples

Taze ve formaldehitle saklanmış dışkı örneklerinde cryptosporidiosisin moleküler tanısı

Pages
120–124
Publication Date
2022-11-05
DOI
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⚡ TL;DR(Too Long; Didn't Read)

As a conclusion, PCR technique is found to be useful for diagnosis in cryptosporodiosis patients with especially those including few oocysts in their fresh feces.

📌 3 Key Takeaways

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Objective & Hypothesis:The acid-fast staining method is widely used in the diagnosis of cryptosporidiosis, a disease causing diarrhea in humans.
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Key Findings & Data:Thirty-three stool samples, belonging to 22 patients who applied to Ege University Hospital, Parasitology Clinic between August 2001 – August 2003 and microscopically diagnosed as cryptosporodiosis has been included in the study.
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Conclusion & Impact:As a conclusion, PCR technique is found to be useful for diagnosis in cryptosporodiosis patients with especially those including few oocysts in their fresh feces.
🔬Design:Research Article
📍Scope:2001 · 33 samples
⚙️Variables:Domain Parameters

Abstract

The acid-fast staining method is widely used in the diagnosis of cryptosporidiosis, a disease causing diarrhea in humans. However in this technique, some of Cryptosporidium spp oocysts can not be stained and seen as formed “ghost-like bodies” and which can only be evaluated by experienced microscopists. In the recent years, PCR technique which is proven to be also highly sensitive in diagnosis and genotyping, is used as an alternative method. In our study we aimed to evaluate the efficacy of PCR in diagnosis of cryptosporodiosis. Thirty-three stool samples, belonging to 22 patients who applied to Ege University Hospital, Parasitology Clinic between August 2001 – August 2003 and microscopically diagnosed as cryptosporodiosis has been included in the study. Twenty-three of these 33 samples were processed immediately, while ten samples were stored in 10% formalin. As the control group, 11 stool samples including 8 specimens with different parasites and 3 negative samples were selected. Nested-PCR is applied to all samples. The sensitivity and specifity of the method for fresh and formalin preserved samples were found to be 100% and 50%, respectively. As a conclusion, PCR technique is found to be useful for diagnosis in cryptosporodiosis patients with especially those including few oocysts in their fresh feces.

Özet

İnsanlarda diyareye neden olabilen cryptosporidiosisin tanısında genellikle asit-fast boyama tekniği kullanılmaktadır. Ancak bu yöntemle bazı Cryptosporidium spp. ookistleri boyanmayıp “hayalet benzeri” yapılar oluşturmakta ve değerlendirme deneyimli uzmanlarca yapılabilmektedir. Son yıllarda tanı ve genotiplendirmede yaygın olarak kullanılan PCR tekniği, yüksek sensitivitesiyle geleneksel yöntemlere alternatif oluşturmaktadır. Cryptosporidiosis tanısında taze ve formaldehitle saklanmış dışkı örneklerinde PCR yönteminin etkinliğini araştırmak amacıyla, Ağustos 2001-Ağustos 2003 tarihleri arasında Ege Üniversitesi Tıp Fakültesi Hastanesi Parazitoloji Polikliniğine başvuran ve dışkı incelemeleri sonucunda Cryptosporidium spp. ookistleri saptanan 22 hastaya ait toplam 33 dışkı örneği çalışmaya alınmıştır. 23'ü taze, 10 tanesi ise %10 formaldehit içinde saklanmış olan bu dışkı örneklerine nested-PCR yöntemi uygulanmıştır. Kontrol grubu olarak, 8'i farklı parazitler içeren, 3'ü parazitolojik açıdan negatif olan toplam 11 dışkı örneği alınmıştır. Uygulanan nested-PCR yönteminin taze dışkılarda sensitivite ve spesifitesi %100, formaldehitli dışkılardaki sensitivitesi ise %50 olarak saptanmıştır. Çalışmamızda, cryptosporidiosisin moleküler tanısında saptanan yüksek sensitivite nedeniyle taze dışkı örneklerinin tercih edilmesi gerektiği ve özellikle az sayıda ookist içeren dışkılarda PCR'ın, asit-fast boyama yöntemine alternatif bir tanı yöntemi olarak kullanılabileceği sonucuna varılmıştır.

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Cite This Article

DAĞCI, H., AKARCA, U. S., TURGAY, N., ERDOĞAN, D. D., ALKAN, M. Z. (2022). The molecular diagnosis of cryptosporidiosis in fresh and formalin preserved fecal samples. Türkiye Parazitoloji Dergisi, Cilt: 33 - Sayı: 2, 120–124. https://ajindex.com/articles/630576

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