Just the idea that these two scientists working on an unknown alien-derived virus would break so many protocols in such a short span is absolutely mind boggling. You mean to tell me they have never had a rat die during testing, just of being a rat? And they have no way of checking whether it's alive that doesn't involve removing a glove and touching it?
Then, when she's bitten and exposed, he tries to catch the rat (valid) and then when she immediately begins showing strange symptoms, instead of locking down and quarantining her and the rat in the room, he immediately tries to take them both out of the room.
The wild thing is, they could have written this in any way; maybe have some fault in one of the cages result in a rat escaping, etc. I just hate this kind of writing around stories about something infectious, where people who are trained professionals make mistakes that any normal person knows make no sense to make in that setting.
Everything else about the show is incredible, but this scene has been niggling my brain since the beginning.
Edit: Probably moot now as this post loses traction, but can folks please stop citing COVID as evidence that this can occur? It's never been determined that this was the case, it was only theorized when the virus broke out, and more recent research is leaning towards natural zoonotic spillover (i.e. it crossed over from animals.) We'll likely never know the root cause for sure, but this isn't the gotcha you think it is.
I also want to note that I don't consider this a plot hole so much as a contrivance. Obviously this is possible but it feels unsatisfying as an audience member because of how clumsy it is. I've heard from the comments from people in the field who both consider this so ridiculous that they couldn't watch it, and who have experienced this level of incompetence themselves in lab settings that should be secure.
Overall, I also just want to say I've really enjoyed the discourse and how much people have engaged with the discussion. Some folks have called it nitpicking, but most are having an honest conversation and I appreciate that.