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The encapsulated fungus Cryptococcus neoformans (Cn) causes cryptococcal meningitis (CM). There are ~180,000 deaths per year worldwide attributed to CM, which is the most common cause of meningitis in adults with HIV in sub-Saharan Africa. HIV infection with advanced immunodeficiency is the most important predisposing risk factor for CM, highlighting the critical role that T cell mediated immunity plays in disease prevention. Numerous studies in the past decade demonstrate that antibody immunity also plays a role in resistance to CM, although its role has taken more time to establish. In mice, B cells reduce early dissemination from lungs to brain, and naïve mouse IgM can enhance fungal containment in the lungs. In concert with these findings, human studies show that patients with CM have lower IgM memory B cell levels and/or different serological profiles than controls. In this article, we review recent data on the role that B cells and/or antibody-based immunity play in host defense against Cn and natural resistance to CM.

Antibody Immunity and Natural Resistance to Cryptococcosis