Is éard is antaigin[1] ann ná aon ábhar coimhthíoch, cosúil le víreas nó baictéar, nuair a théann sé isteach sa cholainn, a spreagann córas imdhíonachta na colainne chun antasubstaintí a chruthú. De ghnáth, treánn antaiginí an cholainn agus iad greamaithe le baictéir nó pailiní. Chun í féin a chosaint a dhéanann an cholainn na hantasubstaintí.[2]
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