DD12 has had a cold the last few days - started with a sore throat, progressed to runny nose and blocked nose, today she has started coughing. She hadn't coughed much before she went to school today, since she came home she has been coughing once every half hour or so, but always after she sniffs, i.e. it's probably post-nasal drip. Does this count as a new cough and do I have to do the whole test and isolate thing AGAIN? (We isolated for DD10's change in sense of taste last week and she tested negative). No fever, no shortness of breath, no change to smell/taste.