DerSarkissian, C. (2019, August 7). Different Types of Flu: Influenza A, B, C and more. Retrieved May 22, 2020, from https://www.webmd.com/cold-and-flu/advanced-reading-types-of-flu-viruses#1
Flu shot: Your best bet for avoiding influenza. (2019, September 12). Retrieved May 22, 2020, from https://www.mayoclinic.org/diseases-conditions/flu/in-depth/flu-shots/art-20048000
Influenza. (n.d.). Retrieved May 22, 2020, from https://www.moh.gov.sg/diseases-updates/influenza
Influenza. (2019, December 2). Retrieved May 22, 2020, from https://www.healthhub.sg/a-z/diseases-and-conditions/103/topics_influenza
Influenza (flu). (2019, October 4). Retrieved May 22, 2020, from https://www.mayoclinic.org/diseases-conditions/flu/symptoms-causes/syc-20351719
Influenza (Seasonal). (2018, November 6). Retrieved May 22, 2020, from https://www.who.int/en/news-room/fact-sheets/detail/influenza-(seasonal)
Ng, T. P., Pwee, K. H., Niti, M., & Goh, L. G. (2002, March 31). Influenza in Singapore: Assessing the Burden of Illness in the Community. Retrieved May 22, 2020, from https://pubmed.ncbi.nlm.nih.gov/11957555/
Paget, J., Spreeuwenberg, P., Charu, V., Taylor, R. J., Iuliano, A. D., Bresee, J., … Viboud, C. (2019, October 22). Global mortality associated with seasonal influenza epidemics: New burden estimates and predictors from the GLaMOR Project. Retrieved May 22, 2020, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6815659/
Seladi-Schulman, J. (2018, June 25). What Are the Pros and Cons of the Flu Shot? Retrieved May 22, 2020, from https://www.healthline.com/health/flu-shot-pros-and-cons
Seladi-Schulman, J. (2018, June 25). What Are the Pros and Cons of the Flu Shot? Retrieved May 22, 2020, from https://www.healthline.com/health/flu-shot-pros-and-cons#takeaway
Vaccine Effectiveness: How Well Do the Flu Vaccines Work? (2020, January 3). Retrieved May 22, 2020, from https://www.cdc.gov/flu/vaccines-work/vaccineeffect.htm