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Volume 18, Number 5—May 2012

Research

Antimicrobial Drug Resistance in Escherichia coli from Humans and Food Animals, United States, 1950–2002

Daniel A. Tadesse, Shaohua Zhao, Emily Tong, Sherry Ayers, Aparna Singh, Mary J. Bartholomew, and Patrick F. McDermottComments to Author 
Author affiliations: Food and Drug Administration, Laurel, Maryland, USA (D.A. Tadesse, S. Zhao, E. Tong, S. Ayers, A. Singh, P.F. McDermott); Food and Drug Administration, Rockville, Maryland, USA (M.J. Bartholomew)

Main Article

Table 3

Multiple antimicrobial drug resistance among Escherichia coli isolates analyzed by source, United States, 1950–2002

No. drug classes to which isolates are resistant % Resistant
Human, n = 983 Animal
Total, n = 1,729
Cattle, n = 323 Chickens, n =138 Pigs, n = 285
0* 64.8 21.4 21.0 21.1 46
1 12.4 9 7.2 9.1 10.8
2 7.5 10.5 16.7 16.1 10.2
3 6.5 22.6 26.8 23.9 14
4 4.5 15.5 14.5 13.3 8.8
5 3.8 7.7 7.2 8.4 5.5
6 0.4 6.2 4.3 2.8 2.2
7 0.1 5.3 2.2 5.3 2.1
8 0 1.9 0 0 0.3

*Susceptible to all drug classes.

Main Article

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