1985 Volume 59 Issue 9 Pages 877-882
Group A streptococci were isolated from 564 (20.9%) out of 2, 694 throat swab samples collected from patients with various infectious diseases during the period from April in 1976 through November in 1984 in Akita Prefecture. When rates of isolation positive by clinical diagnosis were compared, the highest rate (63.5%) was observed in 1st group including scarlet fever and streptococcal infectious disease.The rates (6.7-36.2%) from tonsillitis, angina, pharyngitis and other respiratoty infectious diseases in 2nd group were also significantly higher than those from 3rd group of viral erruptive diseases and other infectious diseases as control.
375 out of 564 isolates were typed into 14 serotypes and 73.9% out of serotyped islates were type 12 (41.9%), type 4 (21.6%) and type 6 (10.4%).However, 189 (33.5%) out of group A streptococci isolated were untypable.
