వ్యాక్సిన్లతో రోగాలు రాకుండా అరికట్టే ప్రక్రియ ఎలా మొదలైంది?

YES ! IF ANYTHING MICROBE LIKE THAT WHICH CAUSES SAME ILLNESS IS INJECTED BACK INTO PATIENT,THEN HEALTHY PERSON DEVELOPS IMMUNITY AGAINST THAT ILLNESS.

      

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