结论老年人免疫功能低下，抗生素的大量应用等是引起医院感染的主要因素。
Conclusions Nosocomial infectious factors are mainly that immune function is lower in the aged and antibiotic is used generally.
每年有许多人因季节性流感患病和死亡，尤其是老年人、2岁以上的儿童以及患有其它病症或免疫系统受损者。
Every year many people suffer and die from seasonal influenza, particularly the elderly, children younger than age 2 and people with other medical conditions or weakened immune systems.
此外，更重要的是，老年人的内在免疫系统对于这种病毒产生了抗体，这样就不会出现那么多人丧生了。
Additionally, and importantly, the older population's in-built immunity to related viruses mean it is highly unlikely so many people will die.
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