FAO guidelines for surveillance of pandemic H1N1/2009 and other influenza viruses in swine populations
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The pandemic H1N1/2009 influenza A virus (pH1N1) is a genetic re-assortment of four different influenza virus strains that includes: (i) a human influenza gene segment, (ii) avian gene segments from North America, (iii) swine influenza gene segments from North America, and (iv) Eurasian avian-like swine gene segments. The initial triple re-assortment, that includes genes of first three virus strains (i, ii and iii) was first seen at least ten years ago and has likely been circulating in pigs sin ce then, causing only very occasional and mild disease in humans in close contact with pigs. The fourth and recent re-assortment between the first triple re-assortment and a Eurasian pig influenza virus had not been detected previously in pigs or humans…