You are treating a seven-year-old girl who has a persistent cough, a low-grade fever (38.5 celsius), and general malaise. her mother insists it can (and should) be treated with antibiotics, since her friend's daughter had the same symptoms last month and received antibiotic treatment. you, however, suspect that it may be a viral disease. you suggest that using an antibiotic may not be the best course of action and try to convince the mother that using an antibiotic will not effectively treat the daughter's condition. the mother says that she would use the antibiotic that her friend's daughter received "just to make sure" that her own daughter will not get worse. what you should do next?