Sounds like they're trying to exclude all possible causes of a positive blood culture for
Streptococcus, which is a sensible thing to do if they can't find a positive source for the infection. It's always good for ID doctors to pounce upon even the slightest symptom if no obvious source can be found - the most surprising things can be found that way.
Still, IV antibiotics are still the first line of treatment here, and it's only been 24 hours. If they start having an effect on the infection and a source can be found, then hopefully you'll be out of there sooner than later.
Get well soon.