The Complement System Infection results in activation of complement proteins via a series of proteolytic reactions that yield biologically active fragments. These coupled proteolytic reactions result in an amplification cascade,in which limited stimulation of proximal complement components results in massive activation of distal complement proteins. The Complement System Infection results in activation of complement proteins via a series of proteolytic reactions that yield biologically active fragments. These coupled proteolytic reactions result in an amplification cascade, in which limited stimulation of proximal complement components results in massive activation of distal complement proteins