Recent research shows that high temperature and high relative humidity may reduce the transmission of Covid-19.
Boosting the percentage of water molecules in the air can help in a few ways. Those water molecules may damage the outer membrane of the virus, making it viable for a shorter amount of time. They also make the tiny droplets that viruses live in heavier, which causes them to fall out of the air more quickly.
The humidity also affects how well your body can defend itself against pathogens and other particles, including viruses. A corona-virus gets into the body through mucous membranes, like your eyes, nose, and mouth. Indoor air tends to dry out those membranes, making your body more vulnerable to pathogens.
Keeping the humidity a little bit higher - allows your body’s first line of defense to work at its optimum level.
If you have one already - make sure it is working properly. If not - you can invest in a larger space humidifier, or if that's not in the budget, a smaller unit - to put in the bedroom or living room. (As seen on TV "click")