One of the reasons the human body gets a fever when you contract a virus is to kill the virus or slow it down. If you breath in at a sauna, hot house or hot summer or dessert air, you can kill viruses in your nasal passage. It's why there is "flu season" in the colder weather. And, despite the naysayers out there, the fact remains that the current virus that everyone is panicking over is weak when it comes to temperature. The serious cases are when it enters the lungs and causes pneumonia, etc. Get out in the sun, take deep breaths of fresh air, eat health foods. You'll reduce your risk of getting sick.