Analysis of day 28 samples demonstrated that, although COVID-19 symptoms had largely resolved in most cases, with only 5 remaining in intensive care at this timepoint, there is still evidence of elevations of FHL-1 and FHR proteins at this time in the most severe cases (Figure 3), most notably FHL-1, FHR2 and FHR5. Here, FHL1 is linked to COVID-19.