In NSF's household germ study, about what share of dish sponges and rags tested positive for coliform bacteria?

The answer

People usually assume the bathroom is the germiest room in the house. NSF found the opposite: over 75% of kitchen sponges and rags carried coliform bacteria, the fecal-indicator group that includes E. coli relatives, because warm, wet sponges are basically a petri dish.

Correct answer: About 75%