In our affluent western world ...

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In our affluent western world - mum&dad, primary schools are the best teachers.  Not so in developing poorer countries where Coloform (E-coli) Typhoid are carried by water that kids have to wash in repeatedly. Animation films for telephones, warnings in school in the local language would be a good first step, provided we all understand that soap and hot water are not available or affordable to many.