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Volume 5, Number 6—December 1999
Dispatch

Changes in Antimicrobial Resistance among Salmonella enterica Serovar Typhimurium Isolates from Humans and Cattle in the Northwestern United States, 1982–1997

Margaret A. DavisComments to Author , Dale D. Hancock, Thomas E. Besser, Daniel H. Rice, John M. Gay, Clive Gay, Lynne Gearhart, and Ronald DiGiacomo
Author affiliations: Washington State University, Pullman, Washington, USA

Main Article

Table 1

Resistance to individual antibiotics among Salmonella Typhimurium isolates from cattle and humans

A. From cattle
Number (%) resistant by year
1982-1985a
1986-1990
1991-1994
1995-1997
Antimicrobial drug
n = 49
n = 116
n = 90
n = 123
Ampicillin 39 (79.6) 99 (85.3) 72 (80.0) 113 (91.9)
Chloramphenicola 2 (4.1) 2 (1.7) 56 (62.2) 90 (73.2)
Gentamicin 1 (2.0) 6 (5.2) 14 (15.6) 5 (4.1)
Kanamycina NA 103 (90.4) 49 (54.4) 50 (40.7)
Streptomycin 43 (87.8) 109 (94.0) 78 (86.7) 116 (94.3)
Tetracycline 43 (87.8) 101 (87.1) 77 (85.6) 115 (93.5)
Trimethoprim NA 1 (0.9) 11 (12.2) 6 (4.9)
Trimethoprim- 7 (14.3) 1 (0.9) 11 (12.2) 9 (7.3)
sulfamethoxazole
Triple sulfa 39 (79.6) 108 (93.1) 75 (83.3) 117 (95.1)
B. From humans
Number (%) resistant by year
1989
1994
1996
1997
Antimicrobial drug
n = 90
n = 189
n = 187
n = 249
Ampicillina 22 (24.4) 107 (56.6) 109 (58.3) 164 (65.9)
Chloramphenicola 3 (3.3) 84 (44.4) 92 (49.2) 116 (46.6)
Gentamicin 2 (2.2) 5 (2.7) 5 (2.7) 2 (0.8)
Kanamycin 25 (27.8) 44 (23.3) 34 (18.2) 47 (18.9)
Streptomycina 42 (46.7) 112 (59.3) 109 (58.3) 174 (69.9)
Tetracyclinea 36 (40.0) 101 (53.4) 109 (58.3) 158 (63.5)
Trimethoprim 0 7 (5.1) 6 (3.1) 5 (2.0)
Trimethoprim- 0 6 (3.7) 6 (3.2) 5 (2.0)
sulfamethoxazole
Triple sulfaa 36 (40.0) 123 (65.1) 143 (76.5) 231 (92.8)

aChi-square test for trend, p value <0.001.
NA, data not available.

Main Article

Page created: December 16, 2010
Page updated: December 16, 2010
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