जेब्ला थि थानदैफेरा देहायाव सोदेरजायो जाहाथे बेयो नांगौ रैखा-होग्रा फिनजाथायखौ जौगाहोयो, बेखौ एकतिब इमिउनायजेसन बुङो।
When specific agents are introduced into the body so that it develops the needed protective response, it is called active immunization.