GoMacro, of Viola, Wis., is recalling MARCOBARS brand almond butter + carob lots 1634 and 1645 and sunflower butter + chocolate lot 1646, because they have the potential to be contaminated with Salmonella, an organism which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems. Healthy persons infected with Salmonella often experience fever, diarrhea (which may be bloody), nausea, vomiting and abdominal pain.