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Parasitol Int ; 66(1): 925-929, 2017 Feb.
Article in English | MEDLINE | ID: mdl-27776999

ABSTRACT

Adult schistosomes were detected in the veins or capillaries of the large intestine, mesentery, liver, and adrenal glands in eight of 13 whooper swans (Cygnus cygnus) examined in Iwate Prefecture, Japan. However, neither eggs nor severe tissue injuries were observed in any of the swans. The schistosomes were definitively identified as Allobilharzia visceralis based on the nucleotide sequences of the ribosomal internal transcribed spacer (ITS) region. Allobilharzia visceralis infections have been reported in whooper swan in Iceland and tundra swan (Cygnus columbianus) in North America. These detections suggest that A. visceralis is distributed extensively along the swan flyways because the swans are migratory birds. To the best of our knowledge, this is the first report of A. visceralis infection in Asia.


Subject(s)
Anseriformes/parasitology , Bird Diseases/parasitology , Schistosomatidae/isolation & purification , Trematode Infections/veterinary , Adrenal Glands/parasitology , Adrenal Glands/pathology , Animals , Bird Diseases/epidemiology , Capillaries/parasitology , DNA, Ribosomal Spacer , Eggs , Female , Intestine, Large/parasitology , Intestine, Large/pathology , Japan/epidemiology , Liver/parasitology , Liver/pathology , Male , Phylogeny , Schistosomatidae/classification , Schistosomatidae/genetics , Trematode Infections/epidemiology , Trematode Infections/parasitology , Veins/parasitology
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