Southern blot of Bartonella spp. genomic DNA. Genomic DNA samples were digested with either BamHI or XbaI as indicated and hybridized to the clone Bva-6.1 probe (for the location within the gene, see Fig. 3A). Bh = B. henselae, Bq = B. quintana, Be = B. elizabethae, Bvb = B. vinsonii subsp. berkhoffii, Bva = B. vinsonii subsp. arupensis, Bb = B. bacilliformis. Molecular weight markers in kb are noted on the left. A 23- to 25-kb weakly hybridizing band for B. quintana is present.