They didn't go out to look for the worms, but they could see signs of them in the amount of carbon in the soil and in changes in the ground cover. (sciencenews.org)
The outside air held mostly bacteria found in soil, water, and leaf surfaces. (discovermagazine.com)
It can live in the soil for as much as 1 year, as it is highly resistant, even to weather changes. (petairapy.com)