Contrary to popular belief, that door handle isn't the worst offender. The main worries include the floor-
90% of shoes have fecal matter on the bottom, which gets tracked in and the tops and sides of bathroom stall doors. Because people are avoiding latches, they then touch these spots. Another suprise? According to a study from the Journal of Applied Microbiology that compared germ dispersal by paper towels, warm air dryers and jet dryers, jet dryers sprayed substantially more viruses, some almost 10 feet from dryer.
WHAT CAN YOU DO:
Avoid setting purses, bags or anything on the floor. If you do, clean them (and whatever you do, don't set them on kitchen counters, where they can transfer germs to food). Use the latches on stall doors and opt for paper towels over jet dryers.