General pointers about influenza.
1) Optimal spread through coughing and sneezing happens at 40F (4.4C) and low humidity. At higher temperatures and humidity, its spread is much more reliant on physical contact contamination.
2) If you are out in public during a flu epidemic, you can significantly protect yourself by using hand sanitizer six times a day. If there is visible contamination, clean with soap and water first. If contact surfaces are a problem, a pump bottle atomizer with 70% rubbing alcohol is effective.
3) Ear loop masks will not protect you from contaminated air. They are used by people with the flu to reduce the contamination they spread when they cough or sneeze. If you must be in a heavily contaminated indoor small area, you need an N95 respirator mask, safety glasses or goggles, and medical gloves.
4) In enclosed areas with sick people, open windows are far more effective in cycling in “fresh air” and eliminating bad air, than are closed loop air conditioners.
5) There are germicidal ultraviolet lights both to sanitize air and for immersion into water. There are also “cold plasma” hand sanitizers that can clean hands in just 10 seconds.
D3. It is easy and so far as I have seen among many people I have induced to use it, pretty much foolproof. It is a quick (8-10 hours) fix if you already have flu and a sure preventative. The avoidance techniques don’t hurt either but, as we all know from living, are not foolproof.