Notes from the field: ascariasis associated with pig farming - Maine, 2010-2013.

During April 2010-March 2013, the Maine Department of Health and Human Services investigated multiple cases of ascariasis that had been reported by health-care providers, veterinarians, and patients. All of the cases were in persons who had lived or worked on Maine farms and had frequent exposure to pigs. Ascariasis, a parasitic roundworm infection caused by Ascaris species, is the most common human intestinal worm infection globally. However, because ascariasis is not a reportable disease, limited data exist regarding the incidence of this infection in the United States, and the number of annual cases in Maine is unknown. After investigation, 14 persons on seven farms in Maine were identified with Ascaris infection.