1. Known intolerance of auranofin or gold compounds. 2. Pregnant or breastfeeding women or women of reproductive potential not using effective contraception or who plan to become pregnant or breastfeed at any given time during the study or within 3 months of study completion. 3. Current use of systemic antibiotics or metronidazole. 4. Has any condition that would, in the opinion of the site investigator, place the subject at an unacceptable risk of injury or render the subject unable to meet the requirements of the protocol. 5. Concurrent participation in other investigational protocols or receipt of an investigational product within the previous 30 days. 6. History of alcohol or drug abuse within the last five years.