What's the possibly of ingesting raccoon roundworm eggs from touching an object on the ground in behind your garage and eating without washing hands?

Usually ingestion: Usually from ingestion of dirt contaminated with fecal material or contaminated foods.

Sooooo rare.: Baylisascaris procyonis eggs can be passed in the feces of Raccoons. You would need to have touch fecal matter or contaminated soil / water that contained the eggs to be able to ingest it. I was only able to find one case of human Baylisascaris procyonis infection for the state of Ohio that has been recorded.