<prompt> The following diagnostic tests are useful for corresponding purposes exceptZiehl-Neelsen staining - Detection of mycobacteriaImmunoflorescence - Detection of Influenza virusSpecific IgM antibodies - Immunity against RubellaSpecific IgM antibodies - Detection of acute infection  <response>: IgM antibody appears following an acute infection. It is not specific for a disease. Ref: Baveja textbook of microbiology; 4th edition 