Any of the several infectious disorders caused by members of streptococcus, a genus of gram positive bacteria belonging to the family Streptococcaceae. Streptococcal infections are classified into Groups A, B, C, D and G. The disease is streptococcal infection (MONDO_0021680). Also known as: Streptococcus caused disease or disorder, Streptococcus disease or disorder, Streptococcus infectious disease.