Material about a 2009 investigation in the "multistate outbreak of human infections due to Salmonella serotype Typhimurium. ... The investigation is ongoing, and exposures to peanut butter and other peanut butter-containing products are being examined." Features a description of the investigation, data, and recommendations for consumers, retailers, directors of food service establishments, and manufacturers. Also includes links to investigation updates and related material. From the Centers for Disease Control and Prevention (CDC).