THE TECHNICAL PROBLEM THAT SUBJECTS IN THE INVENTION IS TO SUPPLY PEPTIDES THAT CORRESPOND WITH IMMUNOLOGICALLY IMPORTANT EPITHOPES IN BACTERIA AND VIRUS PROTEINS, AS WELL AS THE USE OF SUCH PEPTIDES IN DIAGNOSTIC OR IMMUNOGENIC COMPOSITIONS. THE INVENTION REFERS TO A PROCESS FOR THE IN VITRO DETERMINATION OF ANTIBODIES, IN WHICH THE PEPTIDES USED ARE BIOTYLATED, PARTICULARLY IN THE FORM OF BIOTINED PEPTIDES COMPLEXED WITH ESTREPTAVIDIN OR BIOTINED PEPTIDES WITH AVID.
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