Re statement, “Parasites in the soil? Maybe all gardeners should take Ivermectin as a preventative
Yes, all gardeners, barefoot children, beach goers, farmers, pet owners, cow milkers, veteranarians, mountain climbers, campers, lake swimmers, river floaters, dog kissers, pooper scoopers,lay in the grass stargazers, treasure diggers, tissue handlers, laundry doers, diaper changers and baby bathers should take ivermectin as an annual(at least) de-wormer. If you touch, breathe, or injest outdoor or dirty elements you are dealing with parasites...some good, some bad.
That about covers it!
Parasites, be gone!