Representative PFPs from environmental and clinical isolates of Salmonella serotype Weltevreden. Lanes 1 and 20, bacteriophage lambda DNA concatemer standard marker; lanes 2 to 19, PFPs X21 (vegetable), X21 (vegetable), X21 (vegetable), X2 (vegetable), X14 (vegetable), X14 (vegetable), X21 (vegetable), X1 (vegetable), X21 (vegetable), X22 (vegetable), X1 (beef), X4 (clinical), X1 (clinical), X6 (clinical), X3 (clinical), X2 (chicken meat), X10 (clinical), and X14 (clinical), respectively. Numbers on the right indicate the positions of molecular mass markers.