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In one remarkable study, 276 healthy volunteers were given nose drops containing a cold virus.

In the unprecedented experiment, known as a human challenge trial, research subjects ages 18 to 29 were inoculated with nose drops containing a very low dose of an early strain of the pandemic coronavirus.

In the study, 34 healthy volunteers ages 18 to 29 were given nose drops with a small amount of the virus.

None of the nearly 3,000 healthcare workers who used interferon nose drops became infected with the novel coronavirus, according to an informal study report reviewed by Reuters.

“And here are some nose drops, and I have plenty of Kleenex.”