title: Letter: Cross-immunity to influenza B virus strains.
mesh_terms: D000293:Adolescent; D000328:Adult; D000914:Antibodies, Viral / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D003429:Cross Reactions; D005455:Fluorescent Antibody Technique; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D007223:Infant; D009975:Orthomyxoviridae / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D007074:Immunoglobulin G