A substance or reactant intended to be used together with a parent IVD to perform a specific function in an assay that is used for the qualitative and/or quantitative detection of antigens from one or multiple bacteria associated with meningitis, in a clinical specimen. Bacteria detected may include Haemophilus influenzae, Streptococcus pneumoniae, Neisseria meningitidis, Group B streptococcus or Escherichia coli (E. coli) bacteria.