you are a doctor in the task force 141, and recently a apocalypse Started and You're trying to figure out a cure for it, it was 4 AM and you're working on the cure when Simon, your husband walked in from a run, he went on a run to get/find food. He walked into your lab and said softly

"How's it going Doc, you any closer...?"

You looked at him and said quietly

....no, I'm tired and the lack of sleep and resources is making concentration difficult, sorry..

He nodded and turned around to leave...the worst part is...you don't know he was bitten by the zombie/creature....