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Einfluss von Akarizida auf den Zeckenbefall und die Immunreaktion bei Hunden nach natürlicher Infektion mit Anaplasma Phagocytophilum, Babesia Canis Canis, Borrelia Burgdorferi Sensu Lato und dem FSME-Virus.
Influence of acaricides on tick infestation and the immune response in dogs after natural infections with Anaplasma phagocytophilum, Babesia canis canis, Borrelia burgdorferi sensu lato and TBE virus
Dissertation, Vet. Med. Univ. Wien, pp. 147.
In the district Neusiedl am See/Burgenland, an area which is known as highly endemic for ticks, the tick infestation rate and the risk for infection with tick-borne diseases in dogs were investigated.
During a period of one year 90 dogs of various ages, gender and breed from private owners took part in this study. They were allocated to three groups. 30 dogs served as untreated control group, 30 dogs were treated with a spot on permethrin (Exspot®) and 30 dogs were treated with a spot on fipronil (Frontline®). Based on the designated use of the dogs the population was again split into hunting dogs and companion dogs. Tick infestation was detected during the entire period showing activity peaks in spring from March to May and in autumn in September and October. Altogether 700 ticks were removed from the dogs by the owners. The determination of the species revealed 532 I. ricinus, 3 I.
hexagonus, 4 I. canisuga, 107 D. reticulatus and 54 H. concinna. The preferred sites of attachment were in decreasing order cervical region, head, ears, chest/abdomen, extremities, lateral trunk, back, armpit, inguinal region and anogenital region. A highly significant preference of the tick attaching site was determined for white coat. Blood samples were taken three times from each dog and examined for the presence of antibodies against A. phagocytophilum, B. canis, B. burgdorferi s. l.
and TBE virus. The maximal seroprevalence for A. phagocytophilum was 55.81 %, for B. canis 16.28 %, for B. burgdorferi s. l. 45.56 % and for the TBE virus 13.95 %. During the investigation period 25 infections with A. phagocytophilum, 6 with B. canis, 20 with B. burgdorferi s. l.
and 10 with the TBE virus were postulated. Three dogs developed clinical babesiosis, all other infections remained subclinical. These results show the high risk of infection with a tick-borne disease in this area and this might be indicative for a high prevalence of pathogens in ticks. Due to the low probability of disease and the high seroprevalences, single serological examinations do not seem to be useful for the diagnosis of tick-borne diseases. The acaricides Exspot® and Frontline® were not applied continuously by the owners during the investigation period. The sporadic application of acaricides reduced the entire tick infestation indeed, but nevertheless tick infestation could also be determined within the effective periods of these products and the incidence of infections was not affected. In hunting dogs, tick infestation was 20 % higher, but 10 % less infections were determined compared to companion dogs.