Maado kicisa difaaca jirka sabatana ay tahay in ay soo baxdo maadada difaac-jir (antibody) ee caabuqa ladagaalama.
Waa sifo lagu tilmaamo walax ama unug keeni kara jawaab difaac oo jirka ah ama Falcelin Difaac Jirka (immune response), isagoo kiciya samaynta unugyo difaac iyo difaacyo-jir (antibodies).
Difaac-kicin -- Antigenic