Most Probable Questions for IAS Prelims - Qns for 01-02-2021 | ClearIAS

Most Probable Questions for IAS Prelims - Qns for 01-02-2021

Qn.3) With reference to vaccine-derived poliovirus, consider the following statements

1. It is a strain of the weakened poliovirus that was initially included in the oral polio vaccine (OPV).
2. It will change over time and behaves more like the wild or naturally occurring virus.
3. It can be spread more easily to people who are unvaccinated against polio.

Which of the above statements is/are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Ans: (d) 1, 2 and 3

Learning Zone: It is a strain of the weakened poliovirus that was initially included in oral polio vaccine (OPV) and that has changed over time and behaves more like the wild or naturally occurring virus.

This means it can be spread more easily to people who are unvaccinated against polio and who come in contact with the stool or respiratory secretions, such as from a sneeze, of an infected person. These viruses may cause illness, including paralysis.

Why is this question important? In the last one year or so, polio has made a comeback in countries such as the Philippines, Malaysia, Ghana, Myanmar, China, Cameroon, Indonesia and Iran, mostly as vaccine-derived polio infection.



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