If you are bitten by a vampire does that mean you die or now become a vampire?

Answer 1

The question is misleading.

The defining trait of a vampire is the ability to steal life-force from other living things.

You can have this ability while alive (such is the condition of a Dhampir) but you have no need to employ it as the condition of being alive is a self-perpetuating state. It is only when you die that you feel (a real) need to employ this ability and consequently this is only when the distinction of being a vampire is applicable.

There have been incidences where a Dhampir has been very sick, near dying, and has awakened his/her life-stealing abilities to ward off impending death. Most of these become abhorred to discover what they are and either destroy themselves or abstain from the practice and become vampire hunters. Once incidence that I know of concerns a young girl who was informed of her true heritage when it became necessary to rescue her from a fatal illness and became addicted to the practice of stealing life-energy. Fortunately her real father (one of the undead) was recruited to help manage her and reformed her from the practice.

Answer 2

1) If the Vampire injects the venom, then you become one.

2) You die

To become a vampire is a a bit of a delicate process. It take repeated bitings and a gentle, protracted death to enable the contagion to effect the change. As Count Dracula performed on Lucy Westenra (Dracula) or Lestat performed on Louis (Interview with a Vampire). Inductions as depicted in Innocent Blood are ridiculous in the extreme.

Any person bitten by a vampire can recover. A single bite is nothing, hardly noticeable in fact. Lucy Westenra was saved three times by the intervention of Dr. Van Helsing - it was only by constant interference by the count that she died and was inducted. In fact if you are bitten repeatedly and don't die within the first few weeks then you become immune to the induction. Such is the condition of many thralls and minions of vampires.

Most induction are malformed. Count Orlock (Nosferatu) being only a medial example, gross deformities are more common than otherwise. Most people on becoming vampires destroy themselves as they are incapable of reconciling themselves with what they have become.