The different associations of Borrelia burgdorferi sensu lato spirochaetes
with their natural reservoir hosts and tick vectors are slowly being unrave
lled. This review discusses the interactions of different genospecies of Ly
me borreliosis spirochaetes and their differing tick vectors, vertebrate re
servoirs and 'accidental hosts'. Particular reference is made to spirochaet
e-host interactions and occurrence of pathological consequences. Attention
is focused on the unique prevalence of enzoonotic cycles in operation withi
n the UK. Risk factors for acquiring Lyme borreliosis in man are discussed.
(C) 2001 Lippincott Williams & Wilkins.