Make a spray to "stop it" before it makes headway.
Hey had a spray way back in the begginning of the plandemic to do just that and it was quickly taken off the market in order to “study it”.
Everyone I knew that had Covid (including my Shoa-surviving grandparents) who rinsed their sinuses with salt water using a high volume sprayer (like two cups, one into each nostril) basically had a bad head cold.
The theory in Israel was that it kept the viral load in the lungs down by washing out infected drainage that would otherwise load up the lungs.
Did it myself and it worked.