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Severity of the COVID-19 disease ranges from imperceptible to death with the aged and those with pre-existing conditions being particularly vulnerable to severe symptoms. Other factors have also been shown to influence COVID-19 severity. These include smoking, vaping and exposure to air pollution. These factors have a one thing in common, all raise oxidative stress. The Oxidative Stress Index, derived from a questionnaire and reflective of oxidative stress level, is proposed as a non-invasivedoi:10.24018/ejmed.2020.2.2.233 fatcat:zyckqpedkrgjdj7m2vxnxjttxa