"Vaccines are working, but we could do better," said Dr. Matthew Memoli of the National Institutes of Health, who is leading the study that aims to infect up to 100 adults over the next year.
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"It will taste salty. Some will drip down the back of your throat," Memoli said, before squeezing a syringe filled with millions of microscopic virus particles, floating in salt water, into each nostril.