Jonathans Sprouts of Rochester, MA is upgrading its recall of conventional alfalfa sprout products with a specific sell-by date to include all of its alfalfa products, conventional and organic, with all sell-by dates, as a precaution, because it has 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.