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Year : 2018  |  Volume : 11  |  Issue : 12  |  Page : 682-687

High resolution melting real-time PCR detect and identify filarial parasites in domestic cats

1 Master of Science (Public Health) Program in Infectious Diseases and Epidemiology, Faculty of Graduate Studies; Department of Parasitology and Entomology, Faculty of Public Health, Mahidol University, Bangkok, Thailand
2 Department of Parasitology and Entomology, Faculty of Public Health, Mahidol University, Bangkok, Thailand
3 Center for Disease Control, Vector Borne Disease Control Center 11.3 Surat Thani Province, Thailand
4 Department of Parasitology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
5 National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Pathum Thani, Thailand

Correspondence Address:
Usa Lek-Uthai
Programme of Infectious Diseases and Epidemiology, Department of Parasitology and Entomology, Faculty of Public Health, Mahidol University, Bangkok 10400
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1995-7645.248340

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Objective: To detect and identify filarial parasites in dried blood spots (DBS) collected from domestic cats using high resolution melting real-time PCR (HRM RT-PCR). Methods: A total of 208 DBS were collected from domestic cats in a brugian filariasis endemic areas in Surat Thani Province, southern Thailand. Microfilariae were found in 9 blood slides using Giemsa-stained thick blood film. The extracted DNA from blood spot volumes of 10 and 20 μL DBS with positive filarial parasites in cats were performed using HRM RT-PCR method. The primers were designed based on the partial mitochondrial 12S rRNA gene for identifying Brugia malayi, Brugia pahangi, Dirofilaria immitis. All purified samples were then detected. Results: Using different volumes of 10 μL and 20 μL DBS could easily distinguish filarial parasites and showed similar results. PCR amplicons of Brugia malayi, Brugia pahangi and Dirofilaria immitis were determined at melting peak (temperature) of 75.70 77.46 and 73.56 respectively. All 9 positive DBS samples showed positive Brugia pahangi and similar nucleotide sequences. Conclusions: This HRM RT-PCR method is able to diagnose, identify and discriminate filarial parasites collected from DBS, which is simple and inexpensive compared with other probe-based genotyping methods. Furthermore, this method is useful to survey, prevent and control filariasis.

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