Because of the high degree of correlation between some biomarkers (Tables 11, 12, 13), for example, between IFN‐β1 and IFNα2 transcripts (Spearman correlation coefficient =1.00, p < 0.001), we examined the effect of adding a second biomarker as an adjustment to the relationship between each significant biomarker (p < 0.05) with the clinical diagnosis of infection (Tables 4, 5, 6, 8 and 9) or with viral load (Table 7 and individually reported results for ACE2 mRNA, IP‐10 mRNA and IP‐10 protein in text). This evidence concerns the gene IFNB1 and infection.