Notably, the median of serum cardiac troponin I (TNI) showed ~2-fold increase in newborns in the COVID-19 group (20.32 ± 3.41 pg/mL vs. 9.66 ± 1.27 pg/mL, P = 0.007) (Supplementary Table S3), reflecting a strikingly different rate of abnormal TNI (20%, 5/25) in the COVID-19 group vs. (0%, 0/23) in the non-COVID-19 group (P = 0.05; Supplementary Table S4). Here, TNNI3 is linked to COVID-19.