title: Proposed selective immunization of Canadians against A/Swine strain of influenza.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002170:Canada; D006076:Government; D006801:Humans; D009980:Influenza A virus; D007251:Influenza, Human / Q000517:prevention & control*; D008875:Middle Aged; D012306:Risk; D014611:Vaccination / Q000706:statistics & numerical data*