https://slavyanski.net/sb2020/story.php?title=ons-trigger-an-activation-of-the-contact-system-more-potently-than-7 Ons trigger an activation of the contact system more potently than strains isolated from noninvasive infections. The present study gives new insights into the mechanisms by which S. pyogenes triggers the human contact system and stresses the function of soluble and surface located plasmin exploited as a group A streptococcal virulence factor through the action of streptokinase. treptococcus pyogen Sat, 15 Aug 2020 14:11:19 UTC en