Clumping factor A, or ClfA, is a virulence factor from Staphylococcus aureus (S. aureus) that binds to fibrinogen.
ClfA also has been shown to bind to complement regulator I protein.
It is responsible for the clumping of blood plasma observed when adding S. aureus to human plasma. Clumping factor can be detected by the slide test.
- ^ Hair PS; Ward MD; Semmes OJ; Foster TJ; Cunnion KM (July 2008). "Staphylococcus aureus clumping factor A binds to complement regulator factor I and increases factor I cleavage of C3b". The Journal of infectious diseases 198 (1): 125–33. PMID 18544012. doi:10.1086/588825.
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