I thought I read somewhere that they are beginning to realize that all these germicides being overused so constantly is becoming a problem, and people are being sensitized to the chemicals used to kill the bacteria.
I worked with a young fellow who was always sick, and was rather obsessed with germs and what not. Turns out he was constantly on prescription drugs like penecillin. He was diagnosed with a full-body yeast infection.
My son was constantly sick as a baby, and the doctor kept prescribing amoxycillin for anything and everything he said he had. I pressured my wife to switch doctors and not take the kid in every time he sniffled. After going through a bout of something without medical assistance the kid never got sick as frequently again.