Khunti and colleagues discuss the possible association between ethnicity and severity of covid-19. 1 Our experience in London would suggest such a link, and further analysis of clinical outcomes data should be a priority.Ethnicity is multidimensional. 2 Analysis of the UK covid-19 data needs to take into consideration that those of black, Asian, and minority ethnic (BAME) background have vastly heterogenous cultures, behaviours, family and community dynamics, religions, and languages. Defining (even through self-identification) patients as "black" or "Indian" hides the diversity within these ethnic groups, and further subgroup analysis is required to understand the complex social and economic factors at play.
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