Polysaccharide vaccines & thymus-independent antigens

Polysaccharide vaccines (consisting of only polysaccharide, no protein) generate only IgM because they're thymus-independent antigens.
So does this mean they do not generate memory (unless conjugated with a protein, allowing them to cause T-cell dependent activation of B-cells)?

Source: Student Doctor Network - May 11, 2018 Category: Universities & Medical Training Authors: Ven0m Source Type: forums