Paul Offit of the Perelman School of Medicine said treating fevers can prolong or worsen an illness because immunity works better at higher temperatures. While fever reducers can relieve uncomfortable symptoms, “You’re not supposed to feel better,” he said. “You’re supposed to stay under the covers, keep warm, and ride out the infection. We have fevers for a reason.”
https://www.nytimes.com/2021/01/11/well/live/fever-benefits.html The New York Times