Your question is a good one.
Looking at historical examples of how wise people dealt with various difficult situations is instructive. (Too many people today believe that they are smarter than those who came before them. An arrogant delusion.)
But I suggest going back to circa 1300 bce to learn how a great man dealt with dis-ease…
Moses and the Hebrews after forty years of right action and healthy living rose to such great spiritual, intellectual and physical heights that they literally changed human history forever. Their immune systems were bolstered by right living. (They climbed the Tumah Ladder.) And of course before this time, the Hebrews in the Delta of Egypt who heeded Moses were able to mount defences and take effective measures against the ravages of the Ten Plagues. Several of which, I’m sure, were actually viruses.