<s>[INST] My 5 yr old was treated for sinus infection last Wednesday when developed a fever. By Fri showed signs of improvement. Sat. Morning woke to leg pains, then in two hrs went to her back. By Sat afternoon had a serious headache and fever. Sunday seemed better Mon AM complained of back pain and sudden fever to 102 sleeping for 2+ hrs now I looked up meningitis. She s been on amoxicillin since weds evening. [/INST] Hello. I just read through your question. Firstly, if she is able to touch her chin to her chest, she does not have meningitis. There are 2 possible reasons why a child will have fever while on antibiotic. First, this may be a bacterial infection the requirements a different or stronger antibiotic than Amoxicillin.  Second, there may be a viral infection accompanying the bacterial infection that is not susceptible to antibiotics. This time of year, when I hear fever, respiratory symptoms, and muscle ache, I think about Flu. Not that this is necessarily the diagnosis, but viral infections should be considered. I recommend consulting with your doctor, so the correct diagnosis can be made and the appropriate treatment plan implemented. </s>