CD79A and amyotrophic lateral sclerosis: ﻿To evaluate whether the fold change in IgA antibody levels correlated between different specimen types, we calculated Pearson correlation coefficients on the log10-transformed fold change estimates in anti-YghJ IgA among the responders, which included 19 volunteers for ALS, 10 for saliva, 14 for intestinal lavage, while 20 were included for serum analyses.