(July 30, 1:43 p.m.) Samples of irrigation water and serrano peppers taken from a farm in Mexico have tested positive for Salmonella Saintpaul.

David Acheson, the Food and Drug Administration’s associate commissioner for foods, announced the break in the outbreak investigation July 30 during a House subcommittee hearing focused on traceability in the fresh produce industry.

The farm has not yet been publicly identified. Acheson said FDA is investigating where the Mexican grower distributed its product in that country before it entered the U.S.

More than 1,300 people in 43 states, Washington, D.C., and Canada have been affected in the ongoing outbreak, according to the Centers for Disease Control and Prevention.