title: Long-term study of influenza in families.
abstract: This is an account of a five-year study of influenza in families during an interepidemic period. Proven influenza seemed to be a more severe illness than an influenza-like illness. The result of the study suggests that factors other than strain-specific antibodies may be responsible in protecting against influenza during a period of drift.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000914:Antibodies, Viral / Q000032:analysis; D005260:Female; D006801:Humans; D007251:Influenza, Human / Q000235:genetics* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009975:Orthomyxoviridae / Q000276:immunology; D013997:Time Factors; D006113:United Kingdom
chemical_list: D000914:Antibodies, Viral