Medical Genetics 6. Specific Immunodeficiencies A. Transient hypo agammaglobulinemia of infancy a self-limited antibody deficiency of both sexes, with onset at age 3 to 6 mo, persisting usually for 6 to 18 moMedical Genetics 6.Specific Immunodeficiencies A. Transient hypo￾gammaglobulinemia of infancy A self-limited antibody deficiency of both sexes, with onset at age 3 to 6 mo, persisting usually for 6 to 18 mo