サハラ以南のアフリカにおける対外HIV感染:調査データの数学モデリング研究
Steve E Bellan1, Kathryn J Fiorella, Dessalegn Y Melesse
1Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, USA. steve.bellan@gmail.com
Lancet (London, England)
|February 9, 2013
まとめ
エクストラカップルの性関係は,サハラ以南のアフリカにおける新たなHIV感染に大きく寄与し,男性と女性の両方に影響を及ぼしています. 予防の取り組みは,カップルを超えて,一般の性的に活発な人口にまで広がるべきです.
科学分野:
- エピデミオロジー エピデミオロジー
- 公衆衛生は公衆衛生である.
- 数学的モデリング
背景:
- サハラ以南のアフリカにおける異性愛者のHIV感染経路は議論されている.
- 感染の伝播を理解することは,効果的なHIV予防戦略,特に抗レトロウイルス療法 (ART) の進歩において極めて重要です.
研究 の 目的:
- サハラ以南のアフリカにおける共同生活におけるパートナー関係内外のHIV感染経路の割合を推定する.
主な方法:
- 2003年から2011年の人口統計と健康調査 (DHS) のデータを用いて,機械的なHIV感染モデルが開発されました.
- このモデルは,サハラ以南のアフリカ18カ国の27,201の同棲カップルのデータを組み込み,関係期間,性交デビュー時の年齢,HIV感染状況などについて調査した.
- HIV生存率,罹患率,ARTのカバー率の推定値は,感染源 (カップル前形成,カップル内またはカップル外) を決定するために統合されました.
主要な成果:
- 配偶者以外からの感染は,HIV感染の相当な割合を占め,調査対象となったカップルの男性では27%から61%で,女性では21%から51%であった.
- 2011年,カップル外での感染は,男性における新規HIV感染の32%~65%と,同棲カップルの女性における新規HIV感染の10~47%を占めた.
- カップル内での感染は主に男性から女性に発生しますが,女性はカップルを作る前に高いリスクに直面します.
結論:
- エクストラカップルの感染は,新規HIV感染の主要な要因である.
- HIV予防の介入は,単に血清不一致のカップルではなく,より広範な性的に活発な人口をターゲットにすべきです.
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