I actually contacted it from a fish tank once. It was the only case my or any other doctors at that hospital (Kaiser Permanente, Walnut Creek, California) had ever seen. And yes it was life threatening! I was working in a retail fish store at the time and had a small cut on the back of my hand that became a sore which didn't heal for like two months. I finally decided I needed to have it checked out. The doctor found lumps in my lymph system leading up my arm and towards my heart. You could actually see and feel some of them under the skin. Diagnosis was tuberculosis of the lymph system, caused by contact of open wound with infected tank. The doctor thought it was probably a salt water tank. I had to take Isoniazid (TB drug) and Predisone for six months and go for checkups every week. There was a lot of concern about it reaching the heart. This was 30 years ago so I don't know if it's more or less common now. Just thought I would share my "this happened to me" story. Fluttermoth, I will be on the lookout for lightning strikes!