Prevalence of and in collected from dogs in eastern Poland

Ixodes ricinus ticks are an important vector and reservoir of pathogenic microorganisms causing dangerous infectious diseases in humans and animals. The presence of ticks in urban greenery is a particularly important public health concern due to the potential for humans and companion animals to be exposed to tick-borne diseases there. The study assessed the prevalence of Borrelia burgdorferi and Anaplasma phagocytophilum infection in I. ricinus ticks feeding on dogs.

The study consisted in analyses of I. ricinus ticks collected in 2018–2020 from owned and stray dogs in the north-eastern part of Lubelskie province (eastern Poland). An AmpliSens PCR kit was used for qualitative detection and differentiation of tick-borne infections.

Infections of B. burgdorferi and A. phagocytophilum were detected in 10.9% and 12.9% of the examined ticks, respectively. One tick (0.7%) was co-infected by both pathogens. Infection with B. burgdorferi was significantly more highly prevalent in ticks collected from the owned dogs than from the strays (18.7% and 2.8%, respectively), whereas the prevalence of A. phagocytophilum was similar in both groups (12.0% and 13.9%, respectively).

The co-infection observed in the study suggests the possibility of simultaneous infection by both pathogens from a single tick bite. The presence of pathogens in ticks collected from dogs is a factor in assessing infection risk not only to companion animals but also to their owners, who are in close contact with their dogs and visit the same green areas recreationally.