CD79A and malaria: To estimate the relative frequency of PfCSP-specific IgA+ and IgG+ memory B cells in malaria-experienced individuals, we isolated and polyclonally activated the respective B cell subsets from 50 Malian individuals and screened the supernatants for binding to PfCSP and Pf merozoite surface protein-1 (MSP-1) as a blood-stage antigen comparator.