Among those with COVID-19, the risk of developing an autoimmune disease was higher for those with a positive ANA test after COVID-19 diagnosis than those without a positive ANA test after adjusting for age and sex (adjusted risk ratio 11.90 (95% CI 6.28–22.55)) (see Supplementary Figure 2 for flowchart with absolute numbers). Here, BTG3 is linked to COVID-19.