only thing hand sanitizer do is kill the good bacteria thus giving you dry hand. there are 100 trillion non human cells in your body and only 10 trillion human cells.

If your immune system is not challenged than you get autoimmune diseases. All most all of human diseases later in life are autoimmune.

You are born 100 per cent human, but die 90 percent microbial.

Following is from latest issue of NatGeo.

Throat 4,154 species (Neisseria lactamica) Babies have more of this microbe than adults, perhaps because it may help build immunity against meningitis.

Behind the Ears 2,359 species (Propionibacterium acnes) Although associated with acne, this bacterium also inhibits the growth of fungi and yeast on the skin

Nostrils 2,264 species (Staphylococcus speidermidis) This species keeps the nostrils teeming bacterial colonies in equiliberium and suppresses dangerous strains of staph.

Tongue 7,947 species (Streptococcus salivarius) )This bacterium is an ally, helping prevent tooth decay, gum disease and throat infections.

Inner Elbows 2,012 species (Corynebecterium simulans) Generally beneficial, this species has antimicrobial properties that inhibit or kill more harmful pathogens.

Vaginal Openings 2,062 species (Lactobacilus acidophilus) )Lactobacilus produces lactic acid, which maintains a low pH and inhibits the growth of harmful bacteria.

Large Intestine 33,627 species (Bacteroides thetaiotaomicron) The microbe digests starches from plants, allowing infants to shift from mother’s milk to table food.

Personally, I’d like to eliminate the handshakes in the middle.