According to a new study from the University of Arizona, you should probably be washing all the towels in your house more often than you are.
Scientists there tested a bunch of random towels and found that about 90% of them were contaminated with coliform bacteria and about 14% carried E. coli.
Not surprisingly, the more often the towels were washed, the lower the chance they contained the icky microbes. So, run that laundry … for your health. (Time)