binding agent; diagnostic composition; diagnostic kit; methods of diagnosing a bacterial infection or differentiating between a bacterial infection and a viral infection; to rule out a bacterial infection in an individual; to rule out a viral infection in an individual; to consider a bacterial infection in an individual; to consider a viral infection in an individual; to distinguish between a bacterial or mixed infection and a viral infection in an individual; to provide a treatment recommendation to an individual; to provide a diagnostic test recommendation to an individual; to rule out an infectious disease; to identify the type of infection; and device for the diagnosis of bacterial infections