title: Living forwards, understanding backwards.
authors: Health Protection Services, 61 Colindale Avenue, London, NW9 5EQ, England. nick.phin@hpa.org.uk
authors: Nicholas F
authors: NF
authors: Phin
mesh_terms: D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D058873:Pandemics; D012660:Semantics