Honestly, for once the advice is actually pretty clear. If you have a new persistent cough and/or a fever, stay home. I am really struggling at the people on SM, here etc who are asking, "I've woken up with a cough but I feel fine, the advice is so confusing, does this mean I should self isolate."
I honestly worry that such simple instructions are hard for people and assume we'll see it all spreading so much more quickly as people keep themselves home for a runny nose but don't bother with a mild cough.