title: Recent attempts for improved influenza vaccines.
mesh_terms: D000818:Animals; D006801:Humans; D007252:Influenza Vaccines / Q000235:genetics / Q000302:isolation & purification*; D009154:Mutation; D009975:Orthomyxoviridae / Q000235:genetics / Q000302:isolation & purification
chemical_list: D007252:Influenza Vaccines