We detected Borrelia bavariensis in Ixodes ricinus ticks collected near 2 towns in the United Kingdom. Human B. bavariensis infections have not been reported previously in the country, underscoring the value of tick surveillance to warn of emerging human disease. B. bavariensis should be considered in patients with suspected neuroborreliosis.
Keywords: Borrelia bavariensis; Borrelia infections; Ixodes; Lyme disease; United Kingdom; bacteria; neuroborreliosis; ticks; vector-borne infections.