title: Clinical features of bowel anisakiasis in Japan.
abstract: Bowel anisakiasis is rare, and the incidence and clinical features of this condition remain unclear. Using the Japanese Diagnosis Procedure Combination (DPC) in-patient database, we identified 201 cases of bowel anisakiasis between the months of July and December during 2007 and 2008. More than 70% were males. The average age was 54.5 years. Overall, 102 (50.7%) cases had ileus, 16 (8.0%) had perforation or peritonitis, and 4 (2.0%) had intestinal bleeding. Allergic responses, including urticaria, were found in seven (3.5%) patients. Fourteen (7.0%) cases underwent open surgery. Three (1.5%) underwent colonoscopic removal of Anisakis larvae. The average length of stay in the hospital was 9.6 days. The annual incidence of bowel anisakiasis is estimated to be about 3.0 per 1 million people per year. It is important to continue collecting all available data to monitor the trends of this distressing condition.
authors.affiliation: Department of Health Management and Policy, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. yasunagah-jyo@h.u-tokyo.ac.jp
authors.forename: Hideo
authors.initials: H
authors.lastname: Yasunaga
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Horiguchi
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Kuwabara
authors.forename: Hideki
authors.initials: H
authors.lastname: Hashimoto
authors.forename: Shinya
authors.initials: S
authors.lastname: Matsuda
mesh_terms: D000818:Animals; D017129:Anisakiasis / Q000150:complications / Q000175:diagnosis / Q000276:immunology / Q000469:parasitology*; D017163:Anisakis / Q000276:immunology* / Q000302:isolation & purification; D000909:Antibodies, Helminth / Q000276:immunology; D005260:Female; D006801:Humans; D007077:Ileal Diseases / Q000469:parasitology*; D007564:Japan; D008297:Male; D008875:Middle Aged; D009349:Nematode Infections / Q000150:complications / Q000175:diagnosis*
chemical_list: D000909:Antibodies, Helminth