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Staphylococcal protein A (Spa) secreted by all Staphylococcus aureus strains is the major hindrance in development of specific immunoassays for detecting S. aureus antigens, because of its characteristic feature of binding to Fc region of most mammalian immunoglobulins and also to Fab region of certain classes of mammalian immunoglobulins. Immunoglobulin Y (IgY) is the avian equivalent of mammalian...