Seth Berkley Quotes
Now, when you get a viral infection, what normally happens is it takes days or weeks for your body to fight back at full strength, and that might be too late. When you're pre-immunized, what happens is you have forces in your body pre-trained to recognize and defeat specific foes. So that's really how vaccines work.
Citations
Berkley, Seth. "HIV and flu -- the vaccine strategy." TED, Feb. 2010.
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Seth Franklin Berkley (born 1956), is an American medical epidemiologist, the CEO of the GAVI Alliance and a global advocate of the power of vaccines. He is the founder and former president and CEO of the International AIDS Vaccine Initiative (IAVI).