Antimicrobial drug resistance in Escherichia coli from humans and food animals, United States, 1950-2002.

Emerg Infect Dis · 2012 · PMC3358085 · PMID 22515968

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an increasing trendno p-value reported

coli isolates showed an increasing trend in resistance only to ampicillin, sulfonamide, and tetracycline ( Figure 3 , Table 4 ).

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