There is an episode of Sliders (Fever, Season 1, Episode 3), where they slide into a world affected by an infection with no cure, and scanners have been placed at the entrance to every store to detect if you have it.

In the show the disease is used as a classist thing or something. Anyways, its bacterial not viral, and they discover than antibiotics were never discovered so the Professor scrapes some fungus off some trash and takes it and is cured.