Thank you very much for the feedback. I will experiment with some of your suggestions. Another approach might be to have a mechanic wherein the player has a limited number of opportunities to see instantly if a board space is infected without having to move anybody into that space.
It all depends on what you're going for. An instant but limited check to see if a board space still doesn't require much work on the part of the player. Either the space is infected or not and the player can go there or not. That doesn't add too much to the strategy. Some part of the mechanic will need some skill to use effectively. Either acquiring charges of the ability need to be skill based or the information given is not 100% accurate (Like the space only says the distance to the nearest infection not direction, or number of infections around it but not positions, like minesweeper). Something to make sure that someone who thinks about the ability can use it better than someone who doesn't.
Just the thoughts off the top of my head, though.