They found 118 genera of bacteria. That’s more than what’s found on toilets.
"Despite common misconception, it was demonstrated that kitchen environments host more microbes than toilets. This was mainly due to the contribution of kitchen sponges, which were proven to represent the biggest reservoirs of active bacteria in the whole house," the study said.
"Kitchen sponges are likely to collect, incubate and spread bacteria from and back onto kitchen surfaces, from where they might eventually find their way into the human body," the study said. “Direct contact of a sponge with food and/or the human hands might transfer bacteria in and onto the human body, where they might cause infections, depending on their pathogenic potential.”
Although many boil or microwave sponges to rid of toxins, analysts found that the latter method only kills 60 percent of bacteria. Plus, the bacteria could increase after cleaning, because the microbes re-colonize.