Eptesicus-fuscus
Guides
Carios kelleyi
Carios kelleyi is a soft tick (family Argasidae) that parasitizes bats, primarily the big brown bat (Eptesicus fuscus). First described in 1941, this species has been documented across much of North America and has been recorded in at least 29 of the 48 conterminous United States, plus Canada and Cuba. The species has gained attention due to its association with human dwellings when bats roost in attics and structures, and its potential to bite humans when primary bat hosts are removed. Recent studies have identified rickettsial agents in C. kelleyi, including Rickettsia lusitaniae (first U.S. detection), 'Candidatus Rickettsia andeanae', and a Rickettsia parkeri-like agent, raising public health concerns about its vector potential.