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Previously, we reported that Coxiella -like, Rickettsia -like and Arsenophonus -like symbionts could simultaneously coexist in Dermacentor silvarum . In this study, we examined their burdens and population dynamics in a single host during the host life cycle using quantitative PCR. Our results showed that multiple symbionts exhibited different abundances and varying trends in the tick host. Coxiella -like and Rickettsia -like symbionts were found at high densities in large quantities that fluctuated with time. This may coincide with oogenesis and mating of the host. Our findings provide insight into symbiont–tick interactions that lay the foundation for future studies. [ABSTRACT FROM AUTHOR]