These codes are for the U.S. version of "Resident Evil: Outbreak".
I converted them (plus a mem-copy +3 step for the Mastercode) from gameshark.com. For those who want to know how to convert codes by themselves, just go to www.boomspeed.com/kpdavatar & use his code converter.

I have only tested these codes in offline mode, because I hate playing ANY game online, so I don't know if these codes will work online or not. However, when you're playing THIS game online, you're playing it with others, so you shouldn't cheat when you're online.

A few notes about the "Infinite Health" & "Virus Level Is Always Low"
codes. You & your AI-partners will limp or crawl if you take enough damage, but you can NEVER be killed (except by instant-death attacks), & after a few minutes your main character will act just fine. Also, these 2 codes work for P1; they also SEEM to work for your AI-partners, but I'm not completely certain, so that's why those 2 codes have '?' marks at the ends of their names.

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This first set of codes works on the Codebreaker (all versions) & the Gameshark2 (versions 3 & higher).

Mastercode
F012d460-0012d463

Mastercode
Alternate/only for Gameshark2 (versions 3 & higher).
I don't have version 3 or higher myself, so IF the first mastercode doesn't work for those versions, use this one. (I doubt you'll need this one, though).
9012d460-0C04939E

Have All Collection
203232d4-FFFFFFFF
203232d8-FFFFFFFF
203232dC-FFFFFFFF
203232E0-FFFFFFFF
203232E4-FFFFFFFF
203232E8-FFFFFFFF

Have All Levels
20323258-FFFFFFFF

Have Infinity Mode
2031F1FC-FFFFFFFF

Max Result Points/Collection Screen/
You Have To Complete 1 Mission First.
2031F1E0-0001869F

Infinite Health/Everyone?
204A60F4-08FC08FC

Virus Level Is ALways Low/Everyone?
20667dF8-34100000

Infinite Ammo/Works For All Weapons/Everyone
205b1Fd8-24820000

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This other set of codes works on the Action Replay (all versions except the Max) & the Gameshark2 (versions 1 & 2).

Mastercode
EC855788-14449b88

Have All Collection
1CA5b5FC-61dFb00C
1CA5b500-61dFb00C
1CA5b504-61dFb00C
1CA5b508-61dFb00C
1CA5b50C-61dFb00C
1CA5b510-61dFb00C

Have All Levels
1CA5b580-61dFb00C

Have Infinity Mode
1CA87224-61dFb00C

Max Result Points/Collection Screen/
You Have To Complete 1 Mission First.
1CA87208-1455692C

Infinite Health/Everyone?
1CddE31C-0CE2dF09

Virus Level Always Low/Everyone?
1CF1FE20-2846E7A5

Infinite Ammo/Works For All Weapons/Everyone
1CCEA000-38d4E7A5