Seroprevalence in Bats and Detection of in Bat Ectoparasites.

The role of bats in the enzootic cycle of Lyme disease and relapsing fever-causing bacteria is a matter of speculation. In Canada, sensu stricto (ss) is the genospecies that is responsible for most cases of Lyme disease in humans. In this study, we determined if big brown bats, have been exposed to spirochetes from the genus . We collected serum from 31 bats and tested them for the presence of anti- antibodies using a commercial enzyme-linked immunosorbent assay (ELISA). We detected cross-reactive antibodies to spp. in 14 of 31 bats. We confirmed the ELISA data using a commercial immunoblot assay. Pooled sera from ELISA-positive bats also cross-reacted with antigens coated on the immunoblot strips, whereas pooled sera from ELISA-negative bats did not bind to spp. antigens. Furthermore, to identify if bat ectoparasites, such as mites, can carry spp., we analyzed DNA from 142 bat ectoparasites that were collected between 2003 and 2019. We detected DNA for the gene in one bat mite, . The low detection rate of DNA in bat ectoparasites suggests that bats are not reservoirs of this bacterium. Data from this study also raises intriguing questions about infections in bats, including the role of humoral immunity and the ability of bats to be infected with . This study can lead to more sampling efforts and controlled laboratory studies to identify if bats can be infected with and the role of bat ectoparasites, such as in the transmission of this spirochete. Furthermore, we outlined reagents that can be used to adapt ELISA kits and immunoblot strips for use with bat sera.