Human former seasonal Influenza A(H1N1) haemagglutination inhibition data 1977-2009 from the WHO Collaborating Centre for Reference and Research on Influenza, London, UK

In total, 48,707 HI titers measured between 29,600 unique combinations of virus and antiserum are included. Viruses were originally isolated from clinical specimens either by WHO National Influenza Centres or by the WHO Collaborating Centre for Reference and Research on Influenza, London, UK, now the Crick Worldwide Influenza Centre, The Francis Crick Institute, Mill Hill Laboratory, The Ridgeway, Mill Hill, London, NW7 1AA, UK. The HI dataset includes 506 former seasonal A(H1N1) viruses for which HA gene sequence data was matched, for which a table of GISAID Isolate IDs is included.