" In 1918, the Spanish flu killed about 2.7 percent of the world's population. [60] The risk of an outbreak of influenza against which we do not have a vaccine remains a threat constant, which we should take extremely seriously.
During the first months of 2009, thousands of people died from swine flu. For two weeks, it was a recurring topic on the news. However, unlike Ebola in 2014, the number of cases was not doubling, not even increasing in a linear fashion. Some researchers concluded that the flu was not as aggressive as the first warning signs had indicated. However, journalists continued to stoke fear for several weeks. "
― Hans Rosling , Factfulness: Ten Reasons We're Wrong About the World – and Why Things Are Better Than You Think