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. Davis
, Dale D. Hancock, Thomas E. Besser, Daniel H. Rice, John M. Gay, Clive Gay, Lynne Gearhart, and Ronald DiGiacomo
, Dale D. Hancock, Thomas E. Besser, Daniel H. Rice, John M. Gay, Clive Gay, Lynne Gearhart, and Ronald DiGiacomo
Table 2
Antimicrobial resistance patterns for Salmonella Typhimurium isolates from cattle and humans
| A. Cattle | ||||
|---|---|---|---|---|
| Number (%) |
||||
| 1982-1985a |
1986-1990 |
1991-1994 |
1995-1997 |
|
| n = 49 |
n = 114 |
n = 90 |
n = 123 |
|
| ACSSuT | 1 (2.0) | 1 (0.9) | 18 (20.0) | 55 (44.7) |
| ACKSSuT | 0 | 25 (27.8) | 24 (19.5) | |
| ASSuT | 24 (49.0) | 0 | 5 (5.6) | 6 (4.9) |
| AKSSuT | 83 (72.8) | 4 (4.4) | 14 (11.4) | |
| Su | 1 (2.0) | 1 (0.9) | 0 | 0 |
| All Others | 22 (45.0) | 24 (21.1) | 29 (32.2) | 20 (16.2) |
| Susceptb | 1 (2.0) | 5 (4.4) | 9 (10.0) | 4 (3.3) |
| B. Humans | ||||
| Number (%) |
||||
| 1989 |
1994 |
1996-1997 |
||
| n = 90 |
n = 189 |
n = 436 |
||
| ACSSuT | 2 (2.2) | 44 (23.3) | 156 (35.8) | |
| ACKSSuT | 0 | 26 (13.8) | 35 (8.0) | |
| ASSuT | 0 | 14 (7.4) | 24 (5.5) | |
| AKSSuT | 19 (21.1) | 2 (1.1) | 33 (7.6) | |
| Su | 1 (1.1) | 9 (4.8) | 80 (18.4) | |
| All Others | 25 (27.8) | 33 (17.5) | 47 (10.8) | |
| Susceptb | 43 (47.8) | 61 (32.3) | 61 (14.0) | |
aData on kanamycin susceptibility not available for 1982-1985.
bSusceptible to all antimicrobial drugs tested.
A, ampicillin; C, chloramphenicol; T, tetracycline; G, gentamicin; K, kanamycin; S, streptomycin; Su, sulfonamide; Tmp, trimethoprim.
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