highly significantp < 0.0001
weakly significantp = 0.0326
A highly significant increase of both anti-al34k2 IgG1 and IgG4 levels was observed in PD2 by pairwise comparisons between paired samples ( n = 68, p < 0.0001; Figure 4B ); instead, only IgG4 levels showed a weakly significant increase after summer when all samples were considered ( p = 0.0326, Figure 4A ).