Abstract: Provided herein are antibodies and antibody compositions. Also provided are method for obtaining such antibodies and methods for using such antibodies and compositions for treating bacterial and viral infections and for research and screening purposes. The antibodies and compositions can affect the immune system and inhibiting pathogenic infections including streptococcal infections.

Abstract: The invention relates to a method for the determination of an MRM or SRM assay for a protein of interest, a peptide of interest, or a group of proteins/peptides of interest or a whole proteome. It essentially includes the following steps: (1) a list of proteins of interest is selected and for each member at least one or a list of candidate proteotypic peptides is derived (2) this at least one peptide is synthesized/generated essentially without subsequent purification; (3) this at least one unpurified peptide is analyzed by selected reaction monitoring (SRM) preferably coupled to liquid chromatography (LC-SRM) or analogous techniques; (4) validation and/or optimisation of the corresponding assay of the at least one peptide with determination of the SRM coordinates for a peptide/protein of interest and/or of a regulator of interest is achieved.