Those familiar with the Spanish flu of 1918 are aware that H1N1 did not draw much notice when it first appeared in the summer of 1917. Nobody thought that six months later it would bounce back and grow into a worldwide calamity.
對當年 1918 西班牙大流感稍有認知的人都知道，H1N1 首次在 1917 年夏天出現時並沒有引起多大注意，沒想到半年後捲土重來卻造成全球浩劫。