I've used this tactic many times. Trust me, it works. I finally got my wife to try it yesterday after it became obvious that she was about to get sick with lots of coughing and clearing the throat. This morning, not a peep from her. Here's how to do it. It won't work if you wait. The moment you start to notice a discomfort in your throat, goggle with Listerine. DON'T WAIT! (It's a good idea to keep some on hand during cold and flu season). EACH TIME YOU ARE REMINDED BY THAT FEELING IN YOUR THROAT, GARGLE AGAIN, GETTING IT AS FAR DOWN YOUR THROAT WITHOUT SWALLOWING IT AS POSSIBLE. You may GARGLE ten times in a few hours. But the key is to repeat the process every single time you are reminded that you are about to get sick. (caps are used to emphasize the importance)
My theory with this is once you are infected with the virus, it starts to replicate itself until it reaches critical mass, then it's army of attackers are dispersed throughout your body. When that happens, you have a full blown cold or the flu. That sensation in your throat is the virus replicating itself. You must immediately block that replication to defeat it. There's not much you can do if you allow it to replicate other than treating the symptoms. But by killing the germs before they can reach critical mass, you will have sucessfully stopped the invasion that we call a cold or the flu. There is ongoing research to see determine if Listerine will do the same for Covid. If you try it, let us know if it worked for you.