Giardiasis in a white stork in The Netherlands

Giardia sp. was found in the white stork (Ciconia ciconia) in The Netherlan ds for the first time. The Giardia sp. trophozoites that were found in the feces of a 6-wk-old white stork, were examined by light microscopy. The par asites closely resembled Giardia ardeae that bad been isolated by others fr om several species of wading birds belonging to the order Ciconiiformes, sh aring a deeply notched adhesive disk, a single caudal flagellum, and a sing le round median body. Serologically, the parasites did not react with anti- Giardia intestinalis monoclonal antibodies. Although no signs of intestinal disease were observed in the stork chick, the presence of parasites in all stages of development and the huge number of parasites show that the stork chick was experiencing an active infection with G. ardeae type parasites.