It is interesting how the “new Swine Flu” is so genetically different from the H1N1 “seasonal influenza virus”, that still circulates after two years. Interesting, because the new flu appears to have “reverse engineered itself” to infect humans after incorporating DNA found in avian, swine and human viruses, including elements found in European and Asian swine viruses. It is a mystery how the DNA from the aforementioned viruses managed to combine their proteins with H1N1 flu viruses that emanated from the 1918 Spanish flu, then mix with swine flu genes from pigs, making it possible to infect humans.