depends on how the virus acts, if its like the walking dead where everyone is already infected and the bite simply kills you, then cutting it off is the way to go. assuming you can burn it shut, that is. if cutting off your limbs doesnt work i would have to run as far away from my friends, attempting to draw away zombies. if youre dead anyway, may as well save your friends.
on the less likely side, if no one noticed that i was bitten i might try to hide it. i seriously doubt that though, i wouldnt want to endanger ones around me. its possible though lol.