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Asymptomatic subclinical infection may help spread these diseases, particularly "Staphylococcus aureus", "Campylobacter, Salmonella, Shigella, Enterobacter, Vibrio cholerae," and "Yersinia". For example, as of 1984 it was estimated that in the United States, 200,000 people were asymptomatic carriers of "Salmonella".