The whole point of a fever is that the higher temperature harms the disease organism more than the host organism. It is in fact to "kill the virus".
The sauna supports that. The same goes for anything else that would enable the fever of course. You could instead eat hot soup, wear a jacket, or adjust your thermostat.
Going the other way, cooling yourself to suppress a fever, blocks a natural response to infectious disease. Don't do that unless your body has overshot the proper fever temperature by a long ways, to the point that you are at risk of brain damage.
The whole point of a fever is that the higher temperature harms the disease organism more than the host organism. It is in fact to "kill the virus".
The sauna supports that. The same goes for anything else that would enable the fever of course. You could instead eat hot soup, wear a jacket, or adjust your thermostat.
Going the other way, cooling yourself to suppress a fever, blocks a natural response to infectious disease. Don't do that unless your body has overshot the proper fever temperature by a long ways, to the point that you are at risk of brain damage.