<s>[INST] THis is the third time this season my 16 yr old daughter has had the flu. The first two times were 24-48 hrs. This last time has been different. She woke up with a swollen eye 4 days ago. Doctor did rule out pink eye. In the last four days she has had little appetite, low grade fever off and on, and started in with diarrhea today. Is this a different strain of the flu and how long should we give it before taking her back to her doctor? [/INST] Hello,Yes, it is flu, viral infection it usually resolves within a week, diarrhea also seen in some cases, so nothing to worry, maintain hydration, give antipyretics if fever occurs.Hope I have answered your query. Let me know if I can assist you further.Regards,     Dr. Sachin Kumar Agarwal </s>