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The researchers added soil rich with native mycorrhizal fungi obtained from a local restored prairie, referred to as "inoculum," to the experimental green roof's soil.

Inoculation, on the other hand, dates to 1714, in one sense referring to the act of injecting an “inoculum.”

Inoculation, on the other hand, dates to 1714, in one sense referring to the act of injecting an "inoculum."

"If you see more of a viral inoculum, your immune system needs to kick into gear, so you may get higher upper respiratory symptoms — mild, cold-like symptoms," Gandhi said.

"What we know is that masks not only prevent infection, but if they don't fail to prevent infection they're associated with less severe disease, they presumably cut down on the inoculum size."