ラオス中南部の農村地域における児童のタイ肝吸虫感染に関わる要因の検討 : 児童とその家族の生魚の摂取習慣と児童のタイ肝吸虫感染の関連

本報告は, ラオス中南部の農村地域において, 児童のタイ肝吸虫(Opisthorchis viverrini : O. viverrini)感染に関わる要因を検討するために, 対象児童とその家族の日常的な魚の摂取習慣(リスクフィッシュおよび生魚の摂取習慣)と児童のタイ肝吸虫感染の状況との関係を明らかにした. 59組の児童(タイ肝吸虫感染が認められた子どもと認められなかった子ども)の養育者(親)に対して面接調査を実施し, 家族が頻繁に食べる魚, 家族が生で頻繁に食べる魚, 対象児童が魚の生摂取を開始した年齢について回答を得た. その結果, 対象地域では, リスクフィッシュが頻繁に摂取されていた. 家族が頻繁に摂取しているリスクフィッシュ, 生で頻繁に摂取している魚の種類は, 感染群と非感染群の間で有意な差は認められず, 家族の魚の摂取習慣が子どものO.viverrini感染に与える影響は十分に確認できなかった. 一方, 感染群は非感染群に比べて生魚の摂取経験を持っている児童が有意に多く, 児童が幼児期や学童期から生魚の摂取を開始することが, 児童のタイ肝吸虫感染と関連する一因となっていることが示唆された.

To identify risk factors related to children's O. viverrini infection in the central-southern rural area of Laos, we clarified relationships between children's O.viverrini infection and children's and their guardian's habit of eating fish( risk fish and raw fish) in their daily life. To address the present aim, we conducted face to face interviews with 59 paired children's guardians, who were composed of case (children with O.viverrini infection) and control (children without O.viverrini infection) groups. Concretely, we asked what kinds of fish they ate frequently and ate raw frequently in their daily life. In addition, we asked about their children's experience and their starting age for eating raw fish. Based on these results, it was found that the risk fish was frequently eaten. However, we could not clear identify a relationship between children's O.viverrini infection and their frequent eating of risk fish and eating them raw in the family. On the other hand, the children in the case group had more experience of eating raw fish than those in the control group. Therefore, it was suggested that eating raw fish from early childhood might be one of the risk factors for children's O.viverrini infection in this area.