I would be curious to find out how a nail salon performs after a bacteria test. They are largely unregulated, and there are no standards for sterilizing pedicure and manicure equipment.
I was talking to a family friend who is a health professional and they said that there is a lot of interest in looking into the rates of infectious diseases and their relationship to nail salons. Pedicures and manicures often involve cutting cuticles, nails, grinding skin, etc., all of which can result in blood being drawn. My friend said that she wouldn't be surprised if the rate of bacterial and hepatitis infection were higher in these settings than normal.