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The Capsule of Bacillus anthracis Behaves as a Thymus-Independent Type 2 Antigen

ABSTRACT Bacillus anthracis elaborates a homopolymeric capsule composed of γ-d-glutamic acid residues. Mice were immunized with formalin-fixed encapsulated B. anthracis bacilli, and the serum antibody response to a γ-d-glutamyl capsular epitope was measured. Antiglutamyl antibodies were elicited in athymic BALB/c Nu/Nu, BALB/c Nu/+, and CBA/J mice but not in CBA/N xid mice. These response patterns define the capsule of B. anthracis as a thymus-independent type 2 antigen.