The Dentistry Board complaint says Harrington and his staff told investigators that a "high population of known infectious diseasecarrier patients" received dental care from him.
These carrier screenings involve identifying individuals who carry one copy of a gene for a disease that requires two copies for the disease to be expressed in a child.
More significantly, they remain unsure exactly how the disease is transmitted, how it infects the human body, and at what point a carrier of the bacterium may infect others.
Meanwhile, genetic carrier tests are more accurate because scientists know more about single gene disorders, such as Huntington's disease and sickle cell anemia, Faucett said.