H1N1 new gift from China
Quora? Well, it is not H1N1, it is a new strain of flu, not an old strain. "The virus is a unique blend of three lineages: one similar to strains found in European and Asian birds, the H1N1 strain that caused the 2009 pandemic, and a North American H1N1 that has genes from avian, human, and pig influenza viruses."
New study spotlights influenza virus that could wreak havoc if it adapts to humans