[Erikvdb]

Just make your avatar a vizproximity Target

target = vizproximity.Target(avatar)
manager.addTarget(target)

def EnterProximity(e):
    if e.target == target:
        print "Avatar is losing health"

manager.onEnter(None, EnterProximity)

*Code assumes you have already set up your proximity manager, avatar and sensor(s).