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 .