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alexandr1967 [171]
3 years ago
5

Explain the reason there are still some cases of polio in the United States.

Health
1 answer:
mina [271]3 years ago
7 0

1).  The vaccine is not 100% effective.

2).  There are still people who don't allow their children to be vaccinated.  (They don't understand why this is child abuse.)


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