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Why most vaccines have to be given by injection?​

User Dave Moten
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2 Answers

1 vote
Most vaccines are given by injection because injection is the simplest way into your bloodstream
User Xameer
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7.9k points
3 votes
most vaccines need to be given by injection because entering the stomach can make one ill. However entering through the bloodstream doesnt cause illness
User Likk
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7.4k points
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