title: Patchy pig monitoring may hide flu threat.
authors: Declan
authors: D
authors: Butler
mesh_terms: D000818:Animals; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology / Q000302:isolation & purification; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology / Q000635:transmission / Q000821:virology*; D038622:Internationality; D009976:Orthomyxoviridae Infections / Q000453:epidemiology / Q000662:veterinary* / Q000821:virology; D011159:Population Surveillance; D013552:Swine / Q000821:virology*; D013553:Swine Diseases / Q000453:epidemiology* / Q000635:transmission / Q000821:virology; D015047:Zoonoses / Q000453:epidemiology* / Q000635:transmission / Q000821:virology*