Thanks for writing t H.C.M.
I have gone through your query regarding your throat infection
by streph. Though you are taking antibiotic penicillin for last 4 days but unfortunately yu are not getting any relief and still your sputum is mixed with blood.
Considering your symptoms and unsatisfactory results of antibiotic I am suggesting you that you should take antibiotic according to your Culture and sensitivity of throat swab report, if this test is not being done before than do test now. This test will take 72 hours for complition therefore in the meanwhile with the permisson of your treating doctor you may take erythromycin
also to get added advantage.