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この文脈では、東半球における病原体の特性について説明されています。具体的には、多くの病原体が次の特徴を持っていることが述べられています:1. 人間を唯一または主要な宿主として持つ。2. 直接伝播される。3. 獲得免疫を引き起こす。さらに、このような特性は、東半球における長距離旅行が陸路で行われることが一般的であり、そのため病原体の拡散が比較的遅いことに関連しています。

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