Doubts regarding dirt on the carpet

My query is as follows. Please could you assist. I found some dirt on my carpet and when I smelt it, it smelt like stool, I am not sure where it came from but my concern is that my family walked on the carpet with wet feet, however I am not certain if their feet did in fact touch the dirty parts of the carpet. They have subsequently touched their feet with their hands, does this make their hands as well as wet items they touched thereafter napaak? Also they have worn socks and shoes thereafter and possibly perspired in the shoes, are their shoes napaak as well?