First off she is not in a one on one visit with a person giving them medical advice and directions in a business/healthcare environment. This is not an open visit with names exchanged and an actual prescription from her to a specific person. There is no actual violation and she did not in any legal sense give a medical diagnosis/prescription. Secondly nurses are absolutely qualified to quote safe amounts to take and go over medications that are prescribed. It is done all the time in in-home visits and such.
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Lastly yes the flu is scary and you need to protect yourself, wash your hands, act like Baby Yoda Mug Coffee shirt and use sanitizer and common sense. HOWEVER the flu vaccine is bullshit. It is not totally ineffective but it is only SLIGHTLY decent at POSSIBLY protecting you. First off there is no guarantee that you are getting the current seasons strain in your shot.