你有没有想过，为什么疫苗的接种部位通常是胳膊而不是屁股或大腿？尽管撸起袖子确实要方便得多，但是疫苗接种部位的选择没有你想的那么简单。
Hundreds of millions have rolled up their sleeves for the COVID-19 vaccine1, but why haven't they rolled up their pants legs instead? Why do we get most shots in our arms? What's the science behind why we get most vaccines2 in our arm?
数以亿计的人已经接种了新冠疫苗，为什么打疫苗都是撸起袖子而不是卷起裤腿？为什么多数疫苗都是打在胳膊上？这背后有什么科学原理呢？
It's worth noting that most, but not all, vaccines are given in the muscle – this is known as an intramuscular injection.
值得注意的是，多数人（但不是所有人）接种疫苗都是打在胳膊上，号称“肌肉注射”。
Some vaccines, like the rotavirus vaccine, are given orally. Others are given just beneath the skin, or subcutaneously – think of the measles3, mumps4, and rubella vaccine. However, many others are given in the muscle.
有些疫苗是口服的，比如轮状病毒疫苗。其他一些疫苗是皮下注射的，比如麻疹、腮腺炎和风疹疫苗。但是，许多其他疫苗都是肌肉注射的。
But why is the muscle so important, and does location matter?
那么，为什么肌肉注射占比这么大，注射的肌肉部位是否有讲究？
肌肉含有免疫细胞
Muscles make an excellent vaccine administration site because muscle tissue
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