CD79A and COVID-19: Critically, our IgA durability analysis using 28 paired samples obtained 4–6 weeks and 4–10 months after infection revealed that for all donors, Spike-specific IgA titers persisted for as long as 10 months, a finding that is highly relevant for protection of the breastfeeding infant over the course of lactation, and also pertinent to the size of a potential donor pool for collection of milk from COVID-19-recovered donors for therapeutic use of extracted milk IgA.