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(1) Background:  Bartonella  spp. are Gram-negative, facultative, intracellular bacteria transmitted by hematophagous insects. Several species cause zoonotic diseases such as cat-scratch disease.  Bartonella henselae  and  Bartonella clarridgeiae  are the main species found in Thailand, however, there have been few studies on  Bartonella  spp. In addition, the hematological evaluation of  Bartonella -infected animals is limited in Thailand. The aims of this study were prevalence investigation and hematological evaluation of  Bartonella -infected dogs and cats residing in Bangkok, Thailand. (2) Methods: In total, 295 dogs and 513 cats were molecularly evaluated to detect  Bartonella  spp. using PCR with primers targeting the partial  gltA ,  rpoB ,  ftsZ ,  ribC , and  groEL  genes. In total, 651 domestic animals were evaluated for hematological parameters compared between  Bartonella -positive and  Bartonella -negative animals. (3) Results: Overall, the prevalence of  Bartonella  spp. was 1.61% which was found only in free-ranging cats (2.83%).  Bartonella henselae  and  B. clarridgeiae  were confirmed from a concatenated phylogenetic tree of partial  gltA  and  ribC  genes, with 100% bootstrapping replication. For other housekeeping gene sequences, mixed infection was expected from the amplicons of  rpoB ,  ftsZ , and  groEL . Importantly, the mean corpuscular volume (MCV) was significantly increased in  Bartonella -positive cats. (4) Conclusions: We suggest that  B. henselae  and  B. clarridgeiae  are important species and are still circulating in domestic animals, especially cats. The evaluation of blood parameters, especially a raised MCV, should be of concern in  Bartonella  infection in asymptomatic cats. Additionally, the knowledge of how to prevent  Bartonella -related diseases should be promoted with people in at-risk situations.

Molecular Detection of Bartonella spp. and Hematological Evaluation in Domestic Cats and Dogs from Bangkok, Thailand