p62.
For avian (bird) flu, see, e.g., World Health Organisation, “Avian influenza”, available at www.who.int/topics/avian_influenza/en/ . For crop strains, see, e.g., Sarina Macfadyen and David A. Bohan, “Crop domestication and the disruption of species interactions”, Basic and Applied Ecology 11, 2, 2010, pp 116–125.