Story where hospital staff succumb to aliens and wear them close to their bodies

I recently took some tries on Google but I was unable to identify the movie by its plot keywords alone, so here is a challenge for you:

The movie or episode is from the 90’s or around 2000 maybe earlier. It could be an episode of something similar to The Outer Limits.

Its story is about a doctor who discovers his wife or girlfriend (a nurse working in the same hospital as himself) and most other nurses are possessed by dog embryo/puppy (no joke) like aliens they wear close to their bodies after having succumbed to them.

He finds a way to remove the alien from his wife/girlfriend and she then fights with him.

They manage to find the alien nest and kill most of the aliens, but in the end she gets infected again and his attempts to stop the evil aliens fails (bad ending like many of The Outer Limits sci fi episodes).

I also think that at the start of the movie or episode, a close friend of the hero (a doctor like him) is killed which later turns out to be also caused by the aliens (he discovered something he wasn’t meant to discover).