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English, 20.09.2020 04:01 karlyisaunicorn

Question 3 of 3 Why do people need to repeatedly get some vaccines?
Doctors are constantly developing new and better
versions of vaccines
The immune system can forget a pathogen and viruses
can change,
The vaccines aren't permanent and eventually leave the
body
The more vaccines a person gets for a disease the
better protected they are

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Question 3 of 3 Why do people need to repeatedly get some vaccines?
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