1. Zhu, N., et al. A Novel Coronavirus from Patients with Pneumonia in China, 2019. N Engl J Med. 382, 727-733 (2020).
2. World Health Organization. COVID-19 Weekly Epidemiological Update https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---18-may-2021(2021).
3. Rubin, E.J., Baden, L.R. & Morrissey, S. Audio Interview: Covid-19 Vaccine Fundamentals. N Engl J Medicine. 383, e146 (2020).
4. Speiser, D.E., & Bachmann, M.F. COVID-19: Mechanisms of Vaccination and Immunity. Vaccines. 8,404 (2020).
5. Lauring, A.S. & Hodcroft, E.B. Genetic Variants of SARS-CoV-2—What Do They Mean?, JAMA. 325,529-531(2021).
6. The Lancet. India’s COVID-19 emergency. The Lancet. 397, 1683 (2021).
7. Rapid and frequent testing. Nat Biomed Eng. 4, 1121-1122 (2020).
8. Gandhi, M., Yokoe, D.S. & Havlir, D.V. Asymptomatic Transmission, the Achilles’ Heel of Current Strategies to Control Covid-19. N Engl J Med. 382, 2158-2160 (2020).
9. Pollán, M., et al. Prevalence of SARS-CoV-2 in Spain (ENE-COVID): a nationwide, population-based seroepidemiological study. The Lancet. 396, 535-544 (2020).
10. Zoabi, Y., Deri-Rozov, S., & Shomron, N. Machine learning-based prediction of COVID-19 diagnosis based on symptoms. npj Digit Med. 4, 3 (2021).
11. Quer, G,, et al. Wearable sensor data and self-reported symptoms for COVID-19 detection. Nat Med. 27, 73-77 (2021).
12. Lechien, J.R., et al. Olfactory and gustatory dysfunctions as a clinical presentation of mild-to-moderate forms of the coronavirus disease (COVID-19): a multicenter European study. Eur Arch of Otorhino-Laryngology. 277, 2251-2261(2020)
13. Spinato, G., et al. Alterations in Smell or Taste in Mildly Symptomatic Outpatients With SARS-CoV-2 Infection. JAMA. 323, 2089 (2020).
14. Menni, C., et al. Real-time tracking of self-reported symptoms to predict potential COVID-19. Nature Medicine. 26, 1037-1040 (2020).
15. Villerabel, C., et al. Diagnostic Value of Patient-Reported and Clinically Tested Olfactory Dysfunction in a Population Screened for COVID-19. JAMA Otolaryngol Head Neck Surg. 147:271-279 (2021).
16. Kaye, R., et al. COVID-19 Anosmia Reporting Tool: Initial Findings. Otolaryngology–Head and Neck Surg. 163, 132-134 (2020).
17. Golin, A.P., Choi, D. & Ghahary, A. Hand sanitizers: A review of ingredients, mechanisms of action, modes of delivery, and efficacy against coronaviruses. American Journal of Infection Control. 48, 1062-1067 (2020).
18. Astani, A,, Reichling, J. & Schnitzler. P. Comparative study on the antiviral activity of selected monoterpenes derived from essential oils: Antiviral activity of monoterpenes derived from essential oils. Phytotherapy Research. 24, 673-679 (2010).
19. da Silva JKR, Figueiredo PLB, Byler KG, & Setzer WN. Essential Oils as Antiviral Agents, Potential of Essential Oils to Treat SARS-CoV-2 Infection: An In-Silico Investigation. International Journal of Molecular Sciences. 21, 3426 (2020).
20. Huynh-Delerme C, et al. Short Communication: Is Ethanol-Based Hand Sanitizer Involved in Acute Pancreatitis after Excessive Disinfection?—An Evaluation with the Use of PBPK Model. J Toxicol. 2012, 1-7 (2012);2012:1–7.
21. Emadi A & Coberly L. Intoxication of a Hospitalized Patient with an Isopropanol-Based Hand Sanitizer. N Engl J Med. 356, 530-531.
22. Quenan S & Piletta P. Hand dermatitis in healthcare workers: 15‐years experience with hand sanitizer solutions. Contact Dermatitis. 84, 339-340 (2020).
23. Collins GS, Reitsma JB, Altman DG, & Moons K. Transparent reporting of a multivariable prediction model for individual prognosis or diagnosis (TRIPOD): the TRIPOD Statement. BMC Med. 13, 1 (2015).
24. IDESCAT. Statistical Institute of Catalonia. https://www.idescat.cat/emex/?id=431233&lang=en#h1f (2021)
25. European Chemicals Agency. Information on biocides https://echa.europa.eu/es/information-on-chemicals/biocidal-active-substances (2021)
26. Moein ST, et al.. Smell dysfunction: a biomarker for COVID‐19. Int Forum of Allergy Rhinology. 10,944-950 (2020).
27. Iftimie S, et al. First and second waves of coronavirus disease-19: A comparative study in hospitalized patients in Reus, Spain. PLOS ONE.16, e0248029 (2021)
28. Gencat. Salut/Dades COVID. https://dadescovid.cat/setmanal?tipus_territori=territori&id_html=up_4_23&tipus=municipi&codi=43123 (2021)
29. Mola F. Classification and Regression Trees Software and New Developments. In: Rizzi A, Vichi M, Bock H-H, editors. Advances in Data Science and Classification [Internet]. Berlin, Heidelberg: Springer Berlin Heidelberg; 1998 [cited 2021 Apr 11]. p. 311–8. (Bock H-H, Gaul W, Opitz O, Schader M, editors. Studies in Classification, Data Analysis, and Knowledge Organization). http://link.springer.com/10.1007/978-3-642-72253-0_42