A total of 196 small mammals were collected in Portugal and tested for Borrelia burgdorferi sensu lato. Tissue samples were taken from each animal and cultured in Barbour-Stoenner-Kelly (BSK)-II medium. The single strain of spirochete isolated was confirmed as Borrelia lusitaniae by genetic analyses. This is the first report of B. lusitaniae isolated from Apodemus sylvaticus.
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