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Theileria parva  is a tick-transmitted intracellular apicomplexan pathogen of cattle in sub-Saharan Africa that causes East Coast fever (ECF). ECF is an acute fatal disease that kills over one million cattle annually, imposing a tremendous burden on African small-holder cattle farmers. The pathology and level of  T .  parva  infections in its wildlife host, African buffalo ( Syncerus caffer ), and in cattle are distinct. We have developed an absolute quantification method based on quantitative PCR (qPCR) in which recombinant plasmids containing single copy genes specific to the parasite (apical membrane antigen 1 gene,  ama1 ) or the host (hypoxanthine phosphoribosyltransferase 1,  hprt1 ) are used as the quantification reference standards. Our study shows that  T .  parva  and bovine cells are present in similar numbers in  T .  parva -infected lymphocyte cell lines and that consequently, due to its much smaller genome size,  T .  parva  DNA comprises between 0.9% and 3% of the total DNA samples extracted from these lines. This absolute quantification assay of parasite and host genome copy number in a sample provides a simple and reliable method of assessing  T .  parva  load in infected bovine lymphocytes, and is accurate over a wide range of host-to-parasite DNA ratios. Knowledge of the proportion of target DNA in a sample, as enabled by this method, is essential for efficient high-throughput genome sequencing applications for a variety of intracellular pathogens. This assay will also be very useful in future studies of interactions of distinct host- T .  parva  stocks and to fully characterize the dynamics of ECF infection in the field.

Absolute Quantification of the Host-To-Parasite DNA Ratio in Theileria parva-Infected Lymphocyte Cell Lines