Amusing that the start of the apocalypse is now in the past (the main books are set 20 years later), but I really want to point back at these, and in particular the prequel story, when people could have stayed home, avoided the plague, but instead wanted to go cosplay Firefly for a weekend.
Feed's a great epidemiology story, and a fairly good vlogging/social media (they say "blog" but only appear to do video) story, with zombies as almost a totally irrelevant side effect.
The main two caveats I have are technical: The blood testing system is basically what Theranos was pushing, and it probably can't be made to work, the sample sizes are too small. And later has a tiresomely impossible (at least with their tech) medical technology. There's a creepy personal thing, too, but you know, people gotta get their bone on with someone/thing.
I think I haven't read a bunch of the short stories, only the above and "How Green This Land, How Blue This Sea", which is a little silly because it's about Strines vs zombie kangaroos.
"Mira Grant" has a few other horror books, the Parasite series is very zombie-like as well; she's grim and serious but has just a little genre fanservice goofiness to lighten the mood. But the author under her real name, Seanan McGuire, also writes urban fantasy books, and they're dire. Easily some of the trashiest "I'm Wonder Woman and I wanna fuck a monster" books since Laurell K. Hamilton's Anita Blake went off the rails straight into bondage-mutilation-porn-land.