1957–1958 influenza pandemic
... that the 1957–1958 influenza pandemic killed at least one million people worldwide?
... that the <b id="mwB5k"><a href="./1957–1958_influenza_pandemic" id="mwB5o" rel="mw:WikiLink" title="1957–1958 influenza pandemic">1957–1958 influenza pandemic</a></b> killed at least one million people worldwide?