Founded in 1920, NCTC - the National Collection of Type Cultures is the longest-established collection in the world offering a bacterial culture supply service, specialising in micro-organisms of significance for human health.  NCTC’s public access collection comprises over 6,000 bacterial strains, including Hazard Group 3 micro-organisms, spanning diverse clinical infections, global locations and pathogenic properties.  NCTC also supplies DNA and bacteriophage. In addition to the public access collection, NCTC holds a number of historic archive bacterial collections.

NCTC is one of the four collections (ECACC, NCTC, NCPV and NCPF) of the Culture Collections of the UK Health Security Agency.