ホストの免疫と,米国全土でシフィリスの同期的な流行が起きました
Nicholas C Grassly1, Christophe Fraser, Geoffrey P Garnett
1Department of Infectious Disease Epidemiology, Imperial College London, Norfolk Place, London W2 1PG, UK. n.grassly@imperial.ac.uk
Nature
|January 28, 2005
まとめ
米国での梅毒の流行は,社会的な変化だけでなく,自然で周期的なパターンを示しています. 淋病のデータによって裏付けられたこの発見は,病気を明らかにします.
科学分野:
- 人口生態学 人口生態学
- 感染症疫学 感染症疫学
背景:
- 外生的な環境要因と内生的な生物学的要因を区別することは,人口動態と疾患発生率を理解するために重要である.
- 米国における梅毒の流行は,歴史的に社会や行動の変化に起因している.
研究 の 目的:
- 米国で繰り返し発生する梅毒の流行の原因を調査する.
- 梅毒の発生が内生的な生物学的要因または外生的な環境変化によって引き起こされるかどうかを判断する.
主な方法:
- 50年以上に渡る米国におけるシフィリスと淋病の症例データの分析.
- 部分的な保護性免疫を考慮して,梅毒感染の動態のモデリング.
- 梅毒と淋病の振動パターンの比較.
- 異なる都市におけるシフィリスの振動における空間的同期性の評価.
主要な成果:
- 梅毒の流行は,感染の自然なダイナミクスと免疫反応によって予測可能な8〜11年の期間の内生的な,非強制的な振動を示します.
- 保護的な免疫反応が欠けている淋病の症例は,同様の振動を示さないため,内生性梅毒モデルを支持する.
- 梅毒の振動は,時間の経過とともに,米国の都市間でますます同期しています.
結論:
- 米国における梅毒の流行は,外部要因によってのみ引き起こされるのではなく,主に感染と宿主の免疫の内在的なダイナミクスによって引き起こされる.
- 増加する同期性は,米国の性的ネットワーク内の増大する接続性を示唆しています.
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