The following diagnostic tests are useful for corresponding purposes except -
For any infection (including rubella) IgM antibody alone, without IgG means current (acute) infection.


Ziehl Neelsen staining is used for mycobacteria.


Rapid diagnosis of influenza is made by demonstration of viral antigen in specimens by Immunofluorescence.
Ziehl - Neelsen staining - Detection of mycobacteria
Immunofluorescence - Detection of Influenza virus
Specific IgM antibodies - Immunity against Rubella
Specific IgM antibodies - Detection of acute infection