Vampires and werewolves

Both

• Biters
• Transmit their "illness"
• Quickly recover from in injury
• Covens, or packs, they stick together

Vampires

• Elegant, debonair, suave
• Drink the victim's blood
• Hardly change shape (only teeth and maybe eyes?)
• Get them by letting the light shine in

Werewolves

• Animals
• Tear their victims apart
• Change shape painfully
• Get them with silver

Either way, they're exaggerated for effect. The high class vampire lines up with today's rich person, sucking the blood of their victims to stay alive, and occasionally creating another by not quite killing the victim. They need the blood to continue living. The low class werewolves don't actually seem to eat their victims, but create more werewolves through their violence.