is an important vector of infectious human and livestock diseases in Europe. Co-infections of pathogens in ticks and hosts have been reported. Tick cell lines offer a useful model system for study of co-infections. We present a review of the existing literature on co-infections in tick cell lines. Previous studies have demonstrated the usefulness of tick cell lines in studies on co-infection of different pathogens and their interaction with the tick microbiome. We also carried out a preliminary study to investigate the effects of co-culturing and on their growth and interactions with the cell line IRE/CTVM19 over a 13-day period. Replication of both pathogens was quantified by real-time PCR. The presence of appeared to have a slight inhibitory effect on the multiplication of , that were added subsequently. In contrast, the prior presence of appeared to have a stimulatory effect on after 6 days in culture. We conclude that the IRE/CTVM19 tick cell line is suitable for simultaneous and continuous cultivation of both bacteria and can be applied in future research.
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