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Alborosie
3 years ago
5

Why most vaccines have to be given by injection?​

Biology
2 answers:
IRINA_888 [86]3 years ago
5 0
Most vaccines need to be given by injection because entering the stomach can make one ill. However entering through the bloodstream doesnt cause illness
wolverine [178]3 years ago
3 0
Most vaccines are given by injection because injection is the simplest way into your bloodstream
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