Active vaccination in patients with common variable immunodeficiency (CVID).

Area of Science:

• Immunology
• Vaccinology

Background:

• Active vaccination in Common Variable Immunodeficiency (CVID) patients is understudied.
• Some CVID patients exhibit transient vaccine-specific immunity.
• Identifying CVID patients capable of responding to vaccines is crucial for optimizing treatment.

Purpose of the Study:

• To determine if functional classification of B cell subsets can identify CVID patients who respond to vaccination.
• To compare humoral vaccination responses with B cell subset numbers and in vitro antibody production capacity.

Main Methods:

• Twenty-one CVID patients on IgG substitution were immunized with peptide and polysaccharide vaccines.
• Humoral responses were assessed and correlated with circulating memory B cells, CD21(low) B cells, and in vitro antibody production.
• Functional B cell classification was employed for patient stratification.

Main Results:

• Vaccination responses were observed in CVID patients: 23% for polypeptide vaccines and 18% for polysaccharide antigens.
• Class-switched antibody responses were more frequent in CVID group II patients.
• A normal percentage of IgM memory B cells was necessary but not sufficient for polysaccharide vaccine response.

Conclusions:

• Positive vaccination responses are possible in CVID patients, challenging previous assumptions.
• CVID group II patients show a preference for class-switched antibody responses.
• Active vaccination, in addition to IgG replacement, is recommended for CVID type II patients, especially for vaccines with uncertain passive protection.