1) Thompson WW, Shay DK, Weintraub E, Brammer L, Bridges CB, et al. Influenza-associated hospitalizations in the United States. JAMA. 2004;292:1333–1340.
2) Lowen, A. C., Mubareka, S., Steel, J., & Palese, P. (2007). Influenza virus transmission is dependent on relative humidity and temperature. PLoS pathogens, 3(10), 1470–1476.
3) https://www.cdc.gov/flu/about/burden/preliminary-in-season-estimates.htm (2020/02/16)