Task: Translation
Input (Japanese): H1N1ウィルスは通常の季節性インフルエンザと異なり、夏の期間も生存し続け65歳以下の比較的健康な人にも感染する。
Output (English): The H1N1 virus differs from the normal seasonal flu in that it has persisted during the summer months and affected relatively healthy people under the age of 65.