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Dimethyl fumarate is a treatment currently used for multiple sclerosis and psoriasis (a skin condition) which might prevent your immune system from over-reacting to COVID-19, but we do not know for sure whether to assess it in a large group of participants yet. We wish to understand the detailed effects of dimethyl fumarate on people with COVID-19 among about 400 people by conducting some extra tests (see below). The results of these will help us decide whether to continue and enrol several thousand people into an assessment of the drug.