| 1. | Direct detection of influenza virus A and B. | CFT | complement fixation test | |
| 2. | Culture of influenza virus. | ELISA | enzyme-linked immunosorbent assay | |
| 3. | Determination of type an subtype of influenza virus. | IF | immunofluorescence | |
| 4. | Antigenic and/or genetic characterisation of influenza virus. | HI | hemagglutination inhibition assay | |
| 5. | Diagnostic influenza serology. | NAT | nucleic acid amplification techniques | |
| 6. | Storage of clinical samples and virus isolates. | WHO-CC | WHO-Collaboration Centre for Reference and Research on Influenza |