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. 2017 Dec 22;146(4):442–449. doi: 10.1017/S0950268817002862

Fig. 1.

Fig. 1.

Number of people (N = 54) infected with the outbreak strains of Escherichia coli O157:H7, by date of illness onset and dairy education event attendance – Whatcom County, Washington, 20 April–1 June 2015*. *Six additional patients (one primary, five secondary) were ill during 20 April–1 June, but exact illness onset dates were unknown.