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Abstract
Tick-transmitted infections are an emerging problem in dogs. In addition to causing
serious disease in traditional tropical and semi-tropical regions, they are now increasingly
recognized as a cause of disease in dogs in temperate climates and urban environments.
Furthermore, subclinically infected companion animals could provide a reservoir for
human tick-transmitted infectious agents, such as Ehrlichia chaffeensis, Ehrlichia
ewingll, the Ehrlichia phagocytophila group and Rickettsia conorii. Here, we discuss
the emergence of new canine tick-transmitted diseases, which results from several
factors, including the expansion of the tick range into urban and semi-urban areas
worldwide, the movement of infected dogs into previously non-endemic areas, and the
advent of novel molecular techniques for diagnosis and pathogen identification.