Use of multiplex real-time PCR for detection of common diarrhea causing protozoan parasites in Egypt
| Autor: | Heidrun von Thien, Ranya Ayman Samir Tawfik, Egbert Tannich, John T. Nazeer, Magda Youssef Abdel-Hamid, Mahmoud Mohamed El-Sibaei, Khalifa E. Khalifa |
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| Rok vydání: | 2012 |
| Předmět: |
Adult
Diarrhea medicine.medical_specialty Adolescent Dispar Prevalence Cryptosporidium Real-Time Polymerase Chain Reaction Sensitivity and Specificity Microbiology law.invention Entamoeba histolytica Feces Young Adult fluids and secretions Medical microbiology law parasitic diseases medicine Humans Multiplex Child Polymerase chain reaction Protozoan Infections General Veterinary biology Infant General Medicine Middle Aged biology.organism_classification Virology Infectious Diseases Molecular Diagnostic Techniques Insect Science Case-Control Studies Child Preschool Egypt Parasitology medicine.symptom Giardia lamblia Multiplex Polymerase Chain Reaction |
| Zdroj: | Parasitology research. 112(2) |
| ISSN: | 1432-1955 |
| Popis: | Diarrhea is an important cause of morbidity and mortality, worldwide. Giardia intestinalis, Cryptosporidium spp., and Entamoeba histolytica are the most common diarrhea-causing parasitic protozoa. Diagnosis of these parasites is usually performed by microscopy. However, microscopy lacks sensitivity and specificity. Replacing microscopy with more sensitive and specific nucleic acid based methods is hampered by the higher costs, in particular in developing countries. Multiplexing the detection of more than one parasite in a single test by real-time polymerase chain reaction (PCR) has been found to be very effective and would decrease the cost of the test. In the present study, stool samples collected from 396 Egyptian patients complaining of diarrhea along with 202 faecal samples from healthy controls were examined microscopically by direct smear method and after concentration using formol-ethyl acetate. Frozen portions of the same samples were tested by multiplex real-time for simultaneous detection of E. histolytica, G. intestinalis, and Cryptosporidium spp. The results indicate that among diarrheal patients in Egypt G. intestinalis is the most common protozoan parasite, with prevalence rates of 30.5 and 37.1 %, depending on the method used (microscopy vs. multiplex real-time PCR). Cryptosporidium spp. was detected in 1 % of the diarrheal patients by microscopy and in 3 % by real-time PCR. While E. histolytica/dispar was detected in 10.8 % by microscopy, less than one fifth of them (2 %) were found true positive for Entamoeba dispar by real-time PCR. E. histolytica DNA was not detected in any of the diarrheal patients. In comparison with multiplex real-time PCR, microscopy exhibited many false positive and negative cases with the three parasites giving sensitivities and specificities of 100 and 91 % for E. histolytica/dispar, 57.8 and 85.5 % for G. intestinalis, and 33.3 and 100 % for Cryptosporidium spp. |
| Databáze: | OpenAIRE |
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