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http://journals.cambridge.org/action/displayAbstract?aid=39909
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W. W. LAEGREID,
R. O. ELDER
and J. E. KEEN
(1999).
Prevalence of Escherichia coli O157:H7 in range beef calves at weaning. Epidemiology and Infection, 123
,
pp 291-298
doi:10.1017/S0950268899002757