This family consists of several bacterial CAMP factor (Cfa) proteins which seem to be specific to Streptococcus species. The CAMP reaction is a synergistic lysis of erythrocytes by the interaction of an extracellular protein (CAMP factor) produced by some streptococcal species with the Staphylococcus aureus sphingomyelinase C (beta-toxin) [1].

1: Identification, cloning, and expression of the CAMP factor gene (cfa) of group A streptococci. Gase K, Ferretti JJ, Primeaux C, McShan WM; Infect Immun 1999;67:4725-4731. PMID:10456923