A: It is considered advantageous to give the | vedclass

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(A) The oral polio vaccine $(OPV)$,also known as the Sabin vaccine,contains live attenuated (weakened) poliovirus.When administered orally,it mimics t

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The oral polio vaccine $(OPV)$,also known as the Sabin vaccine,contains live attenuated (weakened) poliovirus.When administered orally,it mimics the natural route of infection.This stimulates the production of secretory $IgA$ antibodies in the intestinal mucosa,which provides local intestinal immunity.This local immunity is crucial because it prevents the virus from multiplying in the gut and being shed in feces,thereby interrupting the transmission of the virus and preventing reinfection.Therefore,both the Assertion and the Reason are correct,and the Reason is the correct explanation of the Assertion.

$A$: It is considered advantageous to give the polio vaccine orally.
$R$: It prevents reinfection by causing intestinal immunity.

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$A$: It is considered advantageous to give the polio vaccine orally.$R$: It prevents reinfection by causing intestinal immunity.