Telling the public about “critical control points” is too abstract and unhelpful because it gives no indication of “when” it is necessary to apply hygiene practices
It is better illustrated by talking about daily life tasks and situations which they can relate to and which combine to protect them from infection
To know when to act - it’s always important to be aware of where the germ danger is coming from.
Keeping our homes clean i.e. dirt free does not stop spread of germs, but it helps because germs don’t survive well in clean dry places.