脊髓灰質炎。它是什麼,它是如何傳播的?

3個月前
脊髓灰質炎。它是什麼,它是如何傳播的?

什麼是脊髓灰質炎,它是如何傳播的?

什麼年齡段的人要接種小兒麻痹症疫苗?

你怎樣才能保護兒童?

脊髓灰質炎有不同的種類嗎?

脊髓灰質炎病毒為什麼會回來?

它的問題有多大?


What is polio and how does it spread?

What age do you get the polio vaccine?

How can you protect children?

Are there different kinds of polio?

Why is the polio virus back?

How much of a problem is it?

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