Volume 37, Issue 1 (4-2013)                   Research in Medicine 2013, 37(1): 35-40 | Back to browse issues page

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Salehi N, Aghamolayi S, Taghipour N, Haghighi, A, Abadi A, Tahvildar Biderouni F. Assessment of the ability of PCR for diagnosis of infection with Cryptosporidium in children with diarrhea . Research in Medicine. 2013; 37 (1) :35-40
URL: http://pejouhesh.sbmu.ac.ir/article-1-1149-en.html
Department of Parasitology and Mycology, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran , faridtahvildar@yahoo.com
Abstract:   (9260 Views)
Abstract Background: Usual diagnostic methods for detection of Cryptosporidium include smear preparation, modified Zeihl-Neelsen staining, microscopic examination and observation of oocysts. No studies have been done to compare PCR and Zeihl-Neelsen staining in Iran. This study was done to determine the positive predictive value, (PPV) and the negative predictive value (NPV) of PCR in comparison to modified Zeihl-Neelsen staining for isolation of Cryptosporidium in children with diarrhea. Materials and methods: Direct smears were prepared from fecal samples of 2500 children with diarrhea. Smears were stained by modified Zeihl-Neelsen method and examined by microscope. All samples positive for cryptosporidia and some randomized negative samples were selected for DNA extraction for PCR assay. Results: From 2500 fecal samples, 30 positive cases were detected by modified Zeihl-Neelsen, (Z-N) staining these tested positive by PCR method too however two samples, found to be negative on microscopic examination were positive by PCR technique. PPV and NPV of microscopic examination after staining with Z-N were computed as 94.1% and 100%, PPV and NPV of PCR method were computed as 100%. Conclusion: PCR is a sensitive technique for detection of Cryptosporidium, especially useful in immunocompromised individuals. Keywords: Cryptosporidium, modified Zeihl-Neelsen, PCR.
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Type of Study: Original | Subject: Parasitology
Received: 2013/07/17 | Accepted: 2013/07/17 | Published: 2013/07/17

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