anti-CD138-APC (clone 281–2, BioLegend) and anti-APC magnetic beads
(Miltenyi). CD19+CD138hiIgDneg plasmablasts and
CD19+CD138loIgDneg activated B cells were
sort purified. 1–2 × 106 cells were transferred i.v. to
mice on day 7 p.i. Mice that did not receive cells were given 200 μL of
PBS i.v. on day 7. Sera and spleens were harvested from recipients on day 21
p.i. (day 14 post-transfer). Parasitemia was monitored every 2–3 days
p.i.