title: The classical definition of a pandemic is not elusive.
authors: Victorian Infectious Diseases Reference Laboratory, Department of Epidemiology, Locked Bag 815, Carlton South, Vic. 3053, Australia. heath.kelly@mh.org.au
authors: Heath
authors: H
authors: Kelly
mesh_terms: D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D058873:Pandemics; D012660:Semantics