State health officials warned people today not to eat tofu products from a South San Francisco company because the food may be tainted with a dangerous bacteria.The company, Quong Hop and Co. , has recalled all varieties of its Soy Deli brand tofu with a date code of Dec. 17, 2007, and three other brands: 16-ounce Quong Hop brand Water Pack Tofu with a date code of Sep. 23, 2007; 12-ounce Soy Deli brand Water Pack Tofu with a date code of Sep. 23, 2007, or Oct. 9, 2007; and 30-ounce Soy Deli brand Nigari Tofu dated either Sep. 23, 2007, or Oct. 17, 2007.