Whether Christ's flesh in the patriarchs was infected by sin?

Objections

Objection 1 : It would seem that Christ's flesh was not infected by sin in the patriarchs. For it is written (Wis. 7:25) that "no defiled thing cometh into" Divine Wisdom. But Christ is the Wisdom of God according to 1 Cor. 1:24. Therefore Christ's flesh was never defiled by sin.
Objection 2 : Further, Damascene says (De Fide Orth. iii) that Christ "assumed the first-fruits of our nature." But in the primitive state human flesh was not infected by sin. Therefore Christ's flesh was not infected either in Adam or in the other patriarchs.
Objection 3 : Further, Augustine says (Gen. ad lit. x) that "human nature ever had, together with the wound, the balm with which to heal it." But that which is infected cannot heal a wound; rather does it need to be healed itself. Therefore in human nature there was ever something preserved from infection, from which afterwards Christ's body was formed.