The phage sensitivity and lysogeny of cultures of Streptococcus pyogenes group A isolated in different streptococcal infections

: The collection of moderate phages of S. pyogenes, group A, had been created earlier. As shown in this work, group A streptococcal cultures isolated from patients with rheumatism, glomerulonephritis and tonsillitis exhibited different sensitivity to the phages of this collection: the cultures were lyzed by phages of groups II and III in rheumatism, group III in tonsillitis and group I in glomerulonephritis. The study revealed that lysogeny was widely spread among S. pyogenes strains isolated from patients with different diseases under study. Most frequently occurred among cultures isolated from tonsillitis patients. In this disease only phage-resistant streptococcal cultures proved to be lysogenic. Lysogeny was found among both phage-sensitive and phage-resistant cultures in rheumatism and especially in glomerulonephritis.