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\section{Importance}  Invertebrate models of infection are critical to understanding host-pathogen interactions, having contributed countless discoveries to the biomedical enterprise. Despite the availability of multiple insect host species, we currently lack a robust, long-lived host that thrives at 37$^\circ$C, has low background rates of mortality, and can be easily reared and manipulated in the laboratory without specialized equipment. In the work presented here, we establish that the OS cockroach meets the above criteria and is a permissive experimental host for the model zoonotic pathogen \textit{Francisella tularensis}. Further, relatively little is known regarding how \textit{F. tularensis} survives and is transmitted by environmental arthropods. We show that \textit{F. tularensis} virulence toward OS cockroaches varies according to temperature. Thus, for the first time, investigators will be able to compare temperature-regulated virulence and transmission strategies within a single experimental host. Finally, we demonstrate that the OS cockroach can be used to test the protective efficacy and oral bioavailability efficacy  of new therapeutics. Our findings suggest that the OS cockroach will be an important experimental host species for \textit{F. tularensis} and, perhaps, other bacterial pathogens.