In the beginning of the Crysis2 he said that the Ceph got inside, but I do not understand how. The Nanosuit is supposed to protect him, so how?

To be honest I don't think it matters, but maybe he tried to have six with one of them? You never know.

He was infected while he wasn't wearing the suit. You know, he switched from N1 to N2 at some point before seeing Hargreave.

To be honest I don't think it matters, but maybe he tried to have six with one of them? You never know.
Not funny...

In the beginning of the game he said that the Ceph got inside, but I do not understand how. The Nanosuit is supposed to protect him, so how?
No, the suit is supposed to interact with the Ceph, but maybe Prophet lacked the tools or he got exposed to the spore when he took off his helmet

Either that or when he interacted with the Ceph during the events of Crysis 1 the first nanosuit wasn't good enough at isolating the spore/virus

Ok, but why did the suit not heal him? I mean, it can bring you back from the brink of death, yet not heal you from the virus.