案例：男性，高中生。3天前因咽痛、流涕、干咳、发热而就诊，体温多在38℃左右，自服感冒药无效。同寝室有类似患者。体检右下肺有少量干啰音。X线片显示右下肺淡薄阴影。WBC7.6×109/L，粒细胞82%。根据病情，推测其最可能的病原体是

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