Kelvin, David J, and Amber Farooqui. “Extremely Low Vaccine Effectiveness Against Influenza H3N2 in the Elderly During the 2012 2013 Flu Season”. The Journal of Infection in Developing Countries 7, no. 03 (March 14, 2013): 299–301. Accessed May 2, 2024. https://www.jidc.org/index.php/journal/article/view/23493013.