Coronavirus (COVID-19): What a Pediatrician Wants You to Know | Elisa Song, MD
Got this link from the wife. I have gone through the whole post. This might be the most comprehensive and well researched post on COVID-19 that is helpful to the general population. There's a good amount of info on how to avoid getting the virus, including info on how to strengthen the immune system. There is also this:
Apart from regular hand washing, I believe that daily and frequent nasal irrigation is one of the MOST important things that we can do to prevent influenza and other viral respiratory infections from taking hold. This is because after exposure to a virus, the influenza virus tries to invade and multiply in your nasal passages for at least 1-2 days before you develop any symptoms. Nasal irrigation can wash away viral particles before they have the opportunity to take hold, and thereby prevent many infections from happening in the first place!
I've heard of irrigating your nose. At one point, I even had my own Neti pot at home. What I didn't know is how helpful irrigating your nose is for general health, until I read the quote above.