When I was a kid we used to get this sometimes. We lived in a rural area and played in dirt a lot..LOL...my understanding is that you can get it from the dirt left under fingernails etc. I don't worry too much and still let my kids play in the dirt, but wash hands when we come in etc. When we were kids, my mom used to give us raw garlic chopped up and put into capsules or swallowed as is when we were older...apparently this can kill it. It wouldn't hurt to increase your garlic intake in case