Although Salmonella is generally associated with poultry, it can also contaminate beef. The Centers for Disease Control and Prevention said that 23 percent of outbreaks between 2009 and 2013 were caused by Salmonella.
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Scientists have been studying lymph nodes as a “significant source of Salmonella in cattle,” Lydia Zuraw reproted for Food Safety News. Some researchers think lymph nodes could cause contaiminated beef, especially ground beef, which has been an issue a couple of times in the last two or three years.

In 2012, 46 people in nine different states were infected with Salmonella Enteritidis. Between late 2012 and early 2013, 22 people in six states became infected with Salmonella Typhimurium, according to Food Safety News.