In 1918, a flu pandemic infected millions of people across the world.In 2009, an H1N1 strain of influenza spread around the world, but people who had been alive in 1918 had low rates of infection.What is a likely explanation for this?

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The Answer of In 1918, a flu pandemic infected millions of people across the world.In 2009, an H1N1 strain of influenza spread around the world, but people who had been alive in 1918 had low rates of infection.What is a likely explanation for this?

In 1918, a Flu Pandemic Infected Millions of People Across