Forever Knight.S3E13.Fever

Forever Knight is a 1992 - 1996 Canadian television series about Nick Knight (Geraint Wyn Davies), an 800-year-old vampire working as a police detective in modern-day Toronto, Ontario. Wracked with guilt for centuries of killing others, he seeks redemption by working as a homicide detective on the night shift while struggling to find a way to become human again.
S3E13 - Fever
A new virus puts the vampire community of Toronto at risk when one of Vachon's henchmen unknowingly drains the blood from an infected rat, causing Nick and Natalie to search for a cure.

Aka. The German title for this episode is "Die Infektion" (The Infection)

Guest Starring:
Greg Kramer (Screed)
Bruce Hunter (Calvin)

Cast:
Sarah Orenstein (Linda Wyatt)
Christopher Kennedy (Dan Garrett)
John Blackwood (Preacher)
Chris Britton (Gerald Archer)
Catherine McGregor (Woman in Flashback)

Written by Gillian Horvath
Directed by Alan Simmonds

Post Production Release: 12/21/95

Original Broadcast 30 sec. Promo:
Narrator -"Victims of a deadly plague, born by the very thing that gives them
life. The fate of all vampires is in the hands of Nick Knight. On the next
-Forever Knight-"