Problem to be solved. To provide an antibody for detecting Staphylococcus aureus having excellent detection sensitivity and detection accuracy (bacterial strain specificity). Solution. Provided is an antibody capable of causing an antigen-antibody reaction with an epitope located in a C-terminal domain (CTD) of a ribosome protein L7/L12 in Staphylococcus aureus, wherein the C-terminal domain comprises amino acid residues located at position-55 to position-122, or a fragment of the antibody, or a derivative of the antibody or the fragment.

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