Bartonella spp. have a widespread, global distribution with varying species present among countries from North and South America, Europe, Africa, Asia and Australia. Seroprevalences are also very different depending on the Bartonella species and the country.
Several studies designed to determine the importance of cats as a reservoir for B. henselae showed that prevalence of infection varies considerably among cat populations. Low prevalence rates were detected in cold climates whereas high rates were found in warm and humid climates.
Concerning the infection of dogs with B. vinsonii subsp. berkhoffii, a world-wide distribution is supposed. The epidemiologic situation seems quite distinct between tropical areas, where several studies have shown a high prevalence of antibodies – especially in stray dogs – and more northern regions, where very low rates of prevalence have been detected in domestic dogs, kept as pets.
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