Researchers evaluated serum samples from 5957 dogs in the United States, previously submitted to a diagnostic laboratory.

According to the results, 6.1% of dogs were Bartonella spp. seroreactive. Toy breeds were less likely to be seroreactive than mixed breeds, and dogs less than 1 year old were less likely to be seroreactive than dogs 1 to 5.5 years of age.

Dogs in the West South Central (9.8%) and South Atlantic (8.8%) regions were more likely than dogs elsewhere in the United States.

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Bartonella spp. seroepidemiology and associations with clinicopathologic findings in dogs in the United States