We analyzed the associations between the titer of ppNAT (maximal dilution ratio at half-infection inhibition, ID50) with TAb (undiluted S/CO), IgG-RBD (dilution-quantitative S/CO), IgG-N (dilution- quantitative S/CO), and IgM (dilution-quantitative S/CO) among all 544 donations with detectable TAb. Here, CD40LG is linked to infection.