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2. Winter AL, Eshaghi A, Farrell DJ, King A, Li A, Li Y, et al. Variant influenza A (H1N1) virus infection in Canada. J Clin Virol. 2013;57(3):279–81. https://doi.org/10.1016/j.jcv.2013.03.011 .
3. •• World Health Organization. Human cases of influenza at the human-animal interface, January 2015 – April 2017. Wkly Epidemiol Rec. 2017;92(33):460–75. Available at http://apps.who.int/iris/bitstream/10665/258733/1/WER9233-460-475.pdf . Accessed December 13, 2017. This reference enlists the total number of recorded cases of human cases of influenza at the human-animal interface.
4. Gething MJ, Bye J, Skehel J, Waterfield M. Cloning and DNA sequence of double-stranded copies of haemagglutinin genes from H2 and H3 strains elucidates antigenic shift and drift in human influenza virus. Nature. 1980;287(5780):301–6. http://www.ncbi.nlm.nih.gov/pubmed/7421990 . Accessed December 10, 2017
5. •• Centers for Disease Control and Prevention. Past pandemics. Available at https://www.cdc.gov/flu/pandemic-resources/basics/past-pandemics.html . Accessed 2 December 2017. This reference provides useful information regarding previously documented pandemic influenzas.