| occurrence of salmonella enterica serotype typhimurium dt104a in retail ground beef. | surveillance data of cattle and human isolates of salmonella enterica serovar typhimurium dt104 indicate that this pathogen emerged worldwide in the 1980s, particularly in cattle. studies were conducted to determine the prevalence of salmonella typhimurium dt104 in ground beef. samples were also tested for the presence of generic escherichia coli. a total of 404 fresh ground beef samples obtained at retail stores from new york, san francisco, philadelphia, denver, atlanta, houston, and chicago w ... | 2002 | 11848574 |