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Duplex TaqMan real-time PCR assay for simultaneous detection and quantification of Anaplasma capra and Anaplasma phagocytophilum infection.
Molecular and Cellular Probes 2019 November 13
Anaplasma capra and A. phagocytophilum, two species of the family Anaplasmataceae, are zoonotic tick-borne obligate intracellular bacteria affecting wild and domestic ruminants, dogs, cats, horses and humans. A. capra and A. phagocytophilum infections have been steadily increasing in both number and geographic distribution, and the accurate diagnosis of these infections is challenging. This study aimed to develop a rapid, sensitive and reliable duplex real-time PCR assay for the specific detection and differentiation of these Anaplasma species. We designed primers and probes against the conserved regions of A. capra groEL and A. phagocytophilum 16S rRNA genes. A range of PCR-related parameters were evaluated such as the dosage of primers and probes, and annealing temperature. The specificity, sensitivity and repeatability of this assay were evaluated. Assay performance was further evaluated using samples collected from 124 goats in four regions of Henan, China. This set of samples was also tested using conventional PCR under conditions previously described. The developed duplex real-time PCR assay allowed the simultaneous detection of A. capra and A. phagocytophilum in a reasonably short time at levels as small as 102 copies/μL, respectively, with optimal specificity and reproducibility. In addition, this duplex real-time PCR assay is the first DNA-based method designed to detect A. capra and A. phagocytophilum, and will be valuable for timely diagnosis and treatment of these infections.
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