Abstract
Coxiella burnetii is a zoonotic agent and causes coxiellosis, which is a cause of reproductive failure in a range of animal species, including abortion and stillbirth and Q fever, which is most often characterized by an acute flu-like illness, mild pneumonia, and/or hepatitis in humans. While livestock are well recognized worldwide as a source of infection, the zoonotic risk of C. burnetii infection in companion animals such as dogs may be overlooked. For serological diagnosis, indirect immunofluorescent assay (IFA) and enzyme-linked immunosorbent assay (ELISA) are generally considered good methods for prevalence surveys of coxiellosis. In this study, we conducted a nationwide survey of the seroprevalence of previous exposure to C. burnetii in dogs, dairy cattle, and Korean native cattle (a primarily beef breed) in South Korea. Serum samples obtained from 3087 Korean native cattle, 1224 dairy cattle, and 1023 dogs were collected from eight provinces in South Korea, and IFA and ELISA were performed to test for seropositivity. The prevalence of C. burnetii was 1.7% in Korean native cattle, 10.5% in dairy cattle, and 2.9% in dogs. This is the first report identifying previous exposure to C. burnetii in South Korean dogs. Furthermore, the presence of C. burnetii antibodies in companion and feral dogs indicates that dogs can be a potential reservoir species for zoonotic risk of C. burnetii infection in South Korea. Therefore, more detailed studies aiming to clarify epidemiological factors should be performed in the future.
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