A certain strain of strep known as Group A beta-hemolytic streptococcus can cause scarlet fever and rheumatic fever, both of which are uncommon even when untreated. The incidence of rheumatic fever in patients with untreated strep ranges from 0.1% to 3%, with most cases thought to occur in malnourished persons living in overcrowded conditions. However, to avoid these complications penicillin, erythromycin, etc. are usually prescribed.
The correct homeopathic medicine can cure strep. To be sure that it has, the throat culture needs to be repeated after treatment, and it must read negative for strep.