Kansas City, Kan. ? A Kansas doctor has pleaded guilty to being part of a scheme to sell a phony system to diagnose and cure Lyme disease.

U.S. Attorney Barry Grissom says 61-year-old John R. Toth, of Topeka, pleaded guilty Monday for his part in the fraud. He agreed to pay a $30,000 fine. Sentencing is set for Jan. 18.

Toth admitted that, beginning in September 2001, he and three co-defendants began selling a microscope they said could diagnose Lyme disease. They also promoted a drug treatment plan they claimed could cure the disease. Toth charged patients for use of the microscope and drugs.

Authorities say the drugs caused the death of one Kansas resident and renal failure in another.

Toth’s three co-defendants have pleaded guilty and are awaiting sentencing.