Yes. If you have COVID symptoms, isolate and take a test. Hot yoga strengthens the immune system and helps keep us healthy. Many viruses, bacteria and fungi are sensitive to heat, and prefer a temperature of 37c. The heat in the yoga room creates a hostile environment for these pathogens, inhibiting their ability to grow and reproduce. These pathogens also need to metabolize nutrients, but as your body utilizes more water during class, the pathogens are starved of water. The most important thing to do if you have an infection is to listen to your body. If you have a fever you may find the heat too overwhelming, and you may need to wait a few days before you practice again. If your sinuses are very blocked you could try just doing the standing series, and to just rest in Savasana during the floor series. Stay in the room. The relaxation and the heat will help you recover. Take extra care keeping your hands clean when you have an infection, and avoid touching your mouth, nose and eyes with your hands, to avoid spreading it around.