Six of the genes are closest in sequence to those of H1N2 'triple-reassortant' influenza viruses isolated from pigs in North America around 1999-2000. One question that gets asked quite a bit is where did Bird flu come from.The problem is that there really isn't a definitive answer, a variation of bird flu has probably been around almost since the dawn of human kind in one form or another. Unanswered Questions. This limited host range is apparently responsible for the lack of associated influenza pandemics in contrast with those caused by the morphologically similar influenza A virus as both mutate by both antigenic drift and reassortment. Was the 2009 H1N1 flu virus created in a laboratory? In 1918, J.S. Why does CDC think this? Where Did the H1N1 Late-2009 Flu Season Virus Come From? by Bill Sardi Recently by Bill Sardi: Here Come the Centenarians! How often does reassortment of influenza viruses occur? Koen, a veterinarian, observed a disease in pigs which was believed to be the same disease as the now famous “Spanish” influenza pandemic of 1918. Why does the 2009 H1N1 flu virus have genes from humans, birds, and from pigs on different continents? Influenza B virus is only known to infect humans and seals with influenza. the 2009 swine flu outbreak originated in veracruz, mexico. Influenza was discovered not by a direct study of the disease in humans, but rather from studies on animal diseases. Where did the 2009 H1N1 flu virus come from? health workers traced the virus to a pig farm in this southeastern mexican state. Bird Flu Origins. Why does stryver continually criticize and belittle sydney carton for his social lapses From Tales of two Cities book 2 chapter 11. Have viruses similar to the 2009 H1N1 virus been seen before? Where did the word influenza originate? Michael Worobey at the University of Arizona in Tucson and colleagues developed an unprecedentedly accurate molecular clock approach and used it to reconstruct the origins of the 1918 pandemic H1N1 influenza A virus (IAV), the classical swine H1N1 influenza virus and the post-pandemic seasonal H1N1 lineage that circulated from 1918 until 1957. The swine-origin influenza A (H1N1) virus that appeared in 2009 and was first found in human beings in Mexico, is a reassortant with at least three parents. If your understanding is the current H1N1 late-2009 season flu pandemic began in Mexico as it spread from herds of pigs to humans there you are probably among the millions who have been misled as to the origins of this flu outbreak.