Mum instructed her cleaner which sponge to use on the kitchen floor and which one to use on the surfaces.
She just found out that the cleaner has been doing the opposite, for a long time.
So Mum has, herself, been using a sponge on the surfaces and sometimes the dishes (she usually uses the dishwasher) that has been used on the floor. She says she tends not to put things directly on the countertop.
She has mild digestive symptoms which I attributed to stress and medicines.
I sent a message to the GP, but wondering how worried I should be.