Columbia subject headings:
Influenza viruses--Variation--Congresses.
Influenza--Congresses.
Viral genetics--Congresses.
Harvard subject headings:
Influenza viruses--Variation--Congresses.
Influenza--Congresses.
Influenza--Immunology--Congresses.
Viral genetics--Congresses.
Princeton subject headings:
Influenza viruses--Variation--Congresses.
Influenza--Congresses.
Influenza--Immunology--Congresses.
Viral genetics--Congresses.