Here's some interesting stuff reported in Discover magazine. Ninety-five percent of bacteria found on our hands are under the fingernails. Antimicrobial soaps may help spawn bacteria resistant to antibiotics.
Soap by itself is also very powerful. The only thing is we need to wash our hands for 15 seconds to wipe out most of the organisms. Within 5 seconds of soap hitting our skin dormant viruses and bacteria like E. Coli gets caught in the soapy water. The soap tears off the outer coating of flu viruses. It will also flush away yeast and staph. Remember it will take 15 seconds for all of this to happen.