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Theileria annulata  is an intracellular parasite that causes active and latent forms of bovine theileriosis. Diagnosis of the disease is primarily based on traditional methods such as microscopy, however, PCR based methods have proven to be superior in the absence of clear disease symptoms. However, diagnosis is difficult in cases of lower parasitaemia by conventional PCR. Hence, a rapid and sensitive method which can detect early infection and low parasite load is required. Therefore, we have developed an absolute quantification based real-time PCR (qPCR) assay. Reference standard curve using recombinant plasmids of a host ( hprt ) and a parasite gene ( tasp ) was constructed, and the assay was initially standardised using  in vitro T. annulata  cell lines. Further, 414 blood samples from suspected theileriosis cases were also evaluated using qPCR. The assay can estimate host to parasite ratios, calculate parasitaemia and treatment effectiveness in the clinical cases of theileriosis. In comparison with the conventional PCR results, 44 additional positive cases were found. Therefore, the assay holds importance in a clinical setting due to its ability to quantify the parasite load in clinical samples. It may be further used in distinguishing active and latent theileriosis infections and detection of drug resistance in the field.

A Real-Time PCR based assay for determining parasite to host ratio and parasitaemia in the clinical samples of Bovine Theileriosis