Caught this article... looks like just what you asked for
22 Best (Non-Zombie) Epidemic Infection Horror Movies. Looks like it's missing the "#1" in the list.
I can't recommend any of those however. I don't remember seeing any top notch epidemic films post 1990, except for 12 Monkeys. But if you've never seen The Andromeda Syndrome, I recommend that. It's from 1969, but it's top budget quality film with no zombies, no matter how you define zombies.