SAPI is a family of putative Gram-positive mobile pathogenicity island proteins. SAPIs are responsible for many superantigen-related diseases in humans as they carry two or more superantigens [1,2].

1: The SaPIs: mobile pathogenicity islands of Staphylococcus. Novick RP, Subedi A; Chem Immunol Allergy. 2007;93:42-57. PMID:17369699

2: The phage-related chromosomal islands of Gram-positive bacteria. Novick RP, Christie GE, Penades JR; Nat Rev Microbiol. 2010;8:541-551. PMID:20634809