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i. The Flu Season. Centers for Disease Control and Prevention. https://www.cdc.gov/flu/about/season/flu-season.htm. Accessed 13/03/20.
ii. Common Colds: Protect Yourself and Others. Centers for Disease Control and Prevention. https://www.cdc.gov/features/rhinoviruses/index.html. Accessed 13/02/20.
iii. How Flu Spreads. Centers for Disease Control and Prevention. https://www.cdc.gov/flu/about/disease/spread.htm. Accessed 13/03/20.
iv. Cold and flu viruses: How long can they live outside the body? Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/flu/expert-answers/infectious-disease/faq-20057907. Accessed 13/03/20.
v. Vaccine Effectiveness: How Well Do the Flu Vaccines Work? Centers for Disease Control and Prevention. https://www.cdc.gov/flu/vaccines-work/vaccineeffect.htm. Accessed 13/03/20.
vi. People at High Risk for Flu Complications. Centers for Disease Control and Prevention. https://www.cdc.gov/flu/highrisk/index.htm. Accessed 17/03/20.
vii. Eat This, Not That to Help Fight Colds and Flu. Cleveland Clinic. https://health.clevelandclinic.org/eat-not-fight-colds-flu/. Accessed 17/03/20.
viii. Self-Care for Common Colds: The Pivotal Role of Vitamin D, Vitamin C, Zinc, and Echinacea in Three Main Immune Interactive Clusters (Physical Barriers, Innate and Adaptive Immunity) Involved during an Episode of Common Colds—Practical Advice on Dosages and on the Time to Take These Nutrients/Botanicals in order to Prevent or Treat Common Colds. Journal of Evidence-Based and Complementary Alternative Medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5949172/pdf/ECAM2018-5813095.pdf. Accessed 17/03/20.
ix. Vitamin D. NHS. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/. Accessed 17/03/20.
x. Vitamin C. NHS. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-c/. Accessed 17/03/20.
xi. Why Do We Need Sleep? National Sleep Foundation. https://www.sleepfoundation.org/articles/why-do-we-need-sleep Accessed 17/03/20.
xii. Common Cold Remedies. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/common-cold/in-depth/cold-remedies/art-20046403 Accessed 17/03/20.
xiii. What Happens When Your Immune System Gets Stressed Out? Cleveland Clinic. https://health.clevelandclinic.org/what-happens-when-your-immune-system-gets-stressed-out/ Accessed 17/03/20.
xiv. How to Manage and Reduce Stress. Mental Health Foundation. https://www.mentalhealth.org.uk/publications/how-manage-and-reduce-stress Accessed 17/03/20.