A hospital ship with a distinctive spheroid primary hull — at least in a future anti-time reality created by the Q Continuum circa stardate 47988.1 — which was destoyed by a core breach after being attacked by two Klingon vessels inside their territory.

Its name honors Louis Pasteur (1822-1895), the French chemist who founded the science of modern microbiology, invented the process knows as pasteurization, and developed several vaccines.