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2. Zoe Covid Study. What are the symptoms of COVID-19 if you’re fully vaccinated? https://covid.joinzoe.com/post/new-top-5-covid-symptoms#part_1
3. World Health Organization. WHO COVID-19 Case definition (updated in public health surveillance for COVID-19). 16 Dec 2020. https://www.who.int/publications/i/item/WHO-2019-nCoV-Surveillance_Case_Definition-2020.2
4. Open letter to Chris Whitty and Susan Hopkins: change covid-19 case definition in line with WHO to save lives
5. Covid-19: Sore throat, fatigue, and myalgia are more common with new UK variant