Mold is everywhere! Get those towels totally dry! Spray bleach down the overflow holes in your sinks! Use bleach spray or Softscrub with bleach on your tubs every week! Most of all, keep that fresh air coming in! It's the airborne spores that get you...if they are sucked outside they can't grow more mold nor harm you presently.
These kits promise results that previously required a sample be sent to a lab, in five minutes! Click on image for link.