| new world origins for haemoparasites infecting united kingdom grey squirrels (sciurus carolinensis), as revealed by phylogenetic analysis of bartonella infecting squirrel populations in england and the united states. | phylogenetic analyses of bartonella have suggested divergence between bartonellae that infect mammals native to the old and new worlds. we characterized bartonella isolated from eastern grey squirrels (sciurius carolinensis) in the united states and from grey and red squirrels (sciurus vulgaris) in the united kingdom by nucleotide sequence comparison (glta and groel). isolates from grey squirrels in the united states and the united kingdom were identical, and most similar to bartonella vinsonii, ... | 2002 | 12558350 |