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Competent cultures of the group H streptococcus strains CHALLIS and WICKY autolysed in a buffer at pH 9 containing a reducing agent whereas non-competent organisms did not (Ranhand, Leonard & Cole, 1971). Supernatant fluids of the autolysed competent cultures lysed non-competent WICKY organisms, but were inactive against Hydrogenomonas eutropha, Micrococcus lysodeikticus and a group A streptococcus (strain 60 x 15). Competence factor (CF) obtained by ammonium sulphate precipitation of supernatant fluids of strain CHALLIS grown in a defined medium (Leonard, Ranhand & Cole, 1970) was without lytic activity against non-competent WICKY organisms (Ranhand et al. I 97 I). Sterile supernatant fluids of CHALLIS cultures of declining competence grown for 3 h in a complex medium (brainheart infusion with horse serum (BHI-HS) and neopeptone) have now been found to contain both CF and lytic activity against non-competent WICKY organisms. The lytic activity is selectively destroyed by heat (56 "C for 15 to 30 min). The present report explores the range of lytic activity of crude filtered supernatant fluids of competent CHALLIS cultures grown in BHI-HS plus neopeptone as a preliminary step in defining the nature of the presumptive lysin. Some strains of streptococcal serogroups A, E, H, and K are lysed, whereas representatives of other streptococcal groups and cultures of Staphylococcus aureus, Bacillus subtilis, and Micrococcus lysodeikticus are not.

Lysis of Streptococci by an Extracellular Lysin Produced by Competent Group H Streptococcus Strain CHALLIS