7 year old's throat culture positive for mrsa. Headache, stomach pain, limb pain for past week. On clindamyacin. Can MRSA cause systemic symtoms?

Yes. Mrsa can cause systemic symptoms like a regular infection with staphylococci. Please be sure to complet the course of treatment, even if you feel better sooner.
Define systemic. A kid with a positive throat culture for MRSA may or may not be actually sick with it.It is more common to find in infected skin wounds or abscesses.If you have an abscess you can have fever & feel bad, which are systemic symptoms. If you have it in your blood you are likely flat on your back in an intensive care unit near death. Other things like viruses maybe the cause of the symptoms.