I am of the persuasion that a strong healthy immune system is our best defense. I also believe that one attains a healthy immune system by challenging it, not protecting it from every sniffle, or cough, or boo boo that we get.
We are born without an immune system. Nature makes up for that, at least in mammals, via a mother's milk. Aside from that we are defenseless.
Part of the process is for our bodies to recognize intruders. If my high school biology serves, the immune system goes to war immediately with general purpose protectors while the chemical system in our body produces specially designed anti bodies for each intruder.
I often wonder if those alcohol dispensers that are commonplace today do more harm than good by washing away or killing organisms before the body can begin to identify and produce the specific anti bodies to eliminate the invaders.
In the past two decades, we've heard about super bugs that are nearly impervious to most meds, and the pharmaceutical industry is hard pressed to stay ahead of this development.
I've come to appreciate the end of "War of the Worlds" The extra terrestrials were marching across continents, laying waste to our civilizations, impervious to our weaponry.
In the end, they were destroyed by germs to which they had never been exposed.
Just sayin'.