The Influence of Giardia duodenalis on the Occurrence of Clinical Signs in Dogs

infections are common in dogs and are mainly caused by assemblages C and D. The aim of this study was to investigate the correlation between the presence of and different assemblages detected in symptomatic and asymptomatic dogs and the occurrence of certain clinical signs. All the dogs included ( = 82) were clinically examined, and fecal samples were examined for other parasites and spp. Also, assemblages were detected and the occurrence of certain clinical signs was assessed. A total of 42/82 (51.2%) dogs were symptomatic and had one or more gastrointestinal signs, and 40/82 (48.8%) dogs were asymptomatic. was found in 25/82 (30.5%) dogs: assemblage C in 10/25 (40%) and assemblage D in 15/25 (60%). Only spp. showed a higher coinfection rate with but that did not have an influence on clinical sign appearance. There was no correlation between the presence of different assemblages of and the sex of the host or the duration and appearance of certain clinical signs, except the presence of mucus in feces, which was more frequent in dogs invaded with assemblage C. Further research of other assemblages is needed.