title: Urgent search for flu source.
authors.forename: Declan
authors.initials: D
authors.lastname: Butler
mesh_terms: D000818:Animals; D000829:Animals, Domestic / Q000821:virology; D000835:Animals, Wild / Q000821:virology; D001717:Birds / Q000821:virology; D016358:Contact Tracing / Q000706:statistics & numerical data / Q000662:veterinary; D004197:Disease Reservoirs / Q000662:veterinary / Q000821:virology; D006801:Humans; D009980:Influenza A virus / Q000235:genetics / Q000302:isolation & purification*; D005585:Influenza in Birds / Q000453:epidemiology* / Q000635:transmission / Q000821:virology*; D007251:Influenza, Human / Q000453:epidemiology* / Q000635:transmission / Q000821:virology*; D015047:Zoonoses / Q000453:epidemiology / Q000635:transmission* / Q000821:virology*