In spring 2009, the world treated the so-called swine flu outbreak with extreme caution. However, this dangerous virus was known long before the epidemic had begun. Since the start of the 20th century, it has caused more than 50 million deaths. In 2009, the virus began spreading fast – more and more countries reported new cases each day. It had traveled from Mexico to Japan in several weeks. The World Health Organization raised its global alert level to Phase 6, the top level on its six-point scale. Find out more about the influenza (A) H1N1 pandemic in XL Report on RT.