A material which is used to verify the performance of an assay intended to be used for the qualitative and/or quantitative detection of one or multiple antigens from viruses associated with respiratory diseases in a clinical specimen. Viruses intended to be detected may include respiratory syncytial virus (RSV), influenza viruses, parainfluenza viruses, human metapneumovirus, coronaviruses, enteroviruses, rhinoviruses and/or adenoviruses.