The available vaccines do not seem up to the task of preventing infection by the fourth wave of the Covid-19 virus. Accordingly, people in high-risk groups may want to start on a course of supplementation to address possible deficiencies of selenium, zinc, and vitamin D to strengthen their immune response [Alexander 2020].
Early initiation of adequate selenium, zinc, and vitamin D supplementation in high-risk individuals and in high-risk areas and, certainly, as soon as possible after the time of suspected infection with the Covid-19 virus can help the immune system [Alexander 2020].