Upgrade Your Infirmary ASAP
If it wasn’t already obvious, fighting a group of zombies with a machete is fun, but dangerous work. Unless you’re able to master the art of dodging and managing your stamina effectively, it’s more than likely that one or two of your survivors are going to take a bit of a beating. Trauma, injuries, fatigue, and the Blood Plague all have the ability to render your survivors as good as useless if left untreated.
That’s why you’ll want to make sure you’ve got an Infirmary in your base and upgrade it as soon as possible. This may require the Medical skill, too, so make sure you recruit a survivor early on with this. A level 2 Infirmary will mean that survivors resting at your base passively recover from all of the above (aside from Blood Plague). You’ll also get more beds in your Infirmary to help keep Blood Plague victims alive while you sort a cure, should you need them.