Multiple choice

Which of the following immunological polioviruses was/were the common cause(s) of epidemics?

  1. Type 1

  2. Type 2

  3. Type 3

  4. Types 1 and 3
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A Correct answer
Explanation

Type 1 poliovirus was the common cause of epidemics. It is the most pervasive strain of poliovirus and highly infectious in nature.

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