Crimson Heads= mutation without direct injection 
Mutation happens in all creatures infected with the T-Virus hence why the birds develop a hive system, and insects grow gigantic
Birkin was infected with the g-virus which makes him a different case
wesker I don't think was infected with the T-virus either (Weskers Report)
Steve once again was not infected with the T-virus
Reanimated means that the body is moving
Revived means that the person was dead but is alive
If your in a hospitol die and the doctors save you you were revived

Mutation happens in all creatures infected with the T-Virus hence why the birds develop a hive system, and insects grow gigantic
Birkin was infected with the g-virus which makes him a different case
wesker I don't think was infected with the T-virus either (Weskers Report)
Steve once again was not infected with the T-virus
Reanimated means that the body is moving
Revived means that the person was dead but is alive
If your in a hospitol die and the doctors save you you were revived
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