I didn't know about this until now but 8thdayregret told me
Infected mode will allow you to connect the PSP shooter to the PS3 shooter and infect the main character with the Chimeran virus. Once infected the lead will have a new look, new abilities, new weapons and the game itself will get new dialog because people will react to your infection
More info and video (Here)
as i have the PS3 game i was able to create a savestate for others to use (it's on slot "X"), Enjoy!
This is for the EUR version of the game (UCES01184) I made the save state on 5.00 m33 -6 so i'm not sure of compatibility with other cfws but it works fine on 5.00m33 -6