A century ago the world experienced the deadliest epidemic in human history; The 1918 influenza pandemic; colloquially known as Spanish flu was an unusually deadly  involving H1N1 influenza virus and swine flu in 2009.It infected 500 million people around the world, about 27% of the then world population of between 1.8 and 1.9 billion, including people on isolated Pacific islands and in the Arctic….