The Weekly Epidemiological Record (WER) for 21 October 2011, vol. 86, 43 (pp 469–480) includes: Antigenic and genetic characteristics of zoonotic influenza viruses and development of candidate vaccine viruses for pandemic preparedness; Standardization of terminology of the pandemic A(H1N1) 2009 virus

http://www.who.int/entity/wer/2011/wer8643.pdf