Let's just hop right in.
The infected are the canines that the virus has taken over. They have been taken and the former canine is no longer in control. As far as we know they have no feelings of remorse or regret. They are extremely aggressive but won't attack others that are infected, only the healthy canine is at risk. They are extremely attracted to blood and if a trail is found they can beat the most seasoned tracker.
Rp rules with an infected canine(No bio)-
If no biography has been made for an infected character it may be rped as prey would be. One person may control the infected canine and it's actions, but an infected canine's life must be cut short sometime while your other character is fighting it. If you plan on killing your character with an infected canine, I say that there are more creative ways of doing so, but if it's what you want, go ahead. If you plan on turning your character into one of the infected, simply pay 20RS to the shop and you may do so in whatever way you wish.
With a biography -
If you've made an infected character you may keep it for however long you want, just be fair with it and no godmodding.