COVID-19 vaccine makers at Pfizer once published a story that featured the black-and-white picture of the woman.
showed a woman sitting at a desk with a unique-looking mask over her nose. The social media posts claimed that the photograph showed a mask being worn in February 1919.
In the 1930s, the source of influenza was discovered to be viruses, not bacteria. By the end of the decade, in 1938, Jonas Salk and Thomas Francis developed the first vaccine against flu viruses. Today, about half of Americans get an annual flu shot. In the United States, the [Spanish] flu may have struck as many as 30 percent of the nation's population, killing more than 500,000 people. It is the second deadliest event in American history, behind only the Civil War, and alone dropped the nation's life expectancy by 12 years.
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