E. coli O157:H7 by the Clemson University Cooperative Extension Service, Clemson, South Carolina, U.S.A..
Links for What is E. coli O157:H7?:
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http://www.clemson.edu/extension/hgic/food/food_safety/illnesses/hgic3700.html
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Escherichia coli O157:H7 (E. coli O157) by the Minnesota Department of Health, St. Paul, Minnesota, U.S.A..
http://www.health.state.mn.us/divs/idepc/diseases/ecoli/basics.html -
E. coli 0157:H7 Infection by the New York State Department of Health.
https://www.health.ny.gov/diseases/communicable/e_coli/fact_sheet.htm -
Facts About E. coli O157:H7 by the Vermont Department of Health Agency of Human Services, Burlington, Vermont, U.S.A..
http://healthvermont.gov/prevent/ecoli_0157_H7/E.coli0157H7.aspx -
E. coli O157:H7 by Wikipedia, the free encyclopedia.
https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7