This will, of course, depend on the specific people - it is entirely possible that other peoples will have a different view to that of Early Medieval England. Thus, anyone wanting to write about other peoples is more than welcome to do so, because more points of view are always helpful!
But for Early Medieval England, they knew how to deal with an infection. Here's u/BRIStoneman's post on the medical textbook Bald's Leechbook and what it advises for infections.