Table 5. Frequency (%) of resistance to the 15 antimicrobials tested by year of isolation for Salmonella spp. strains.
| Antibiotics | Year (number of isolates) | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1983 (n=1) | 1984 (n=2) | 1986 (n=13) | 1987 (n= 2) | 1988 (n=3) | 1990 (n=10) | 1991 (n=8) | 1992 (n=19) | 1993 (n=37) | 1994 (n=4) | 1995 (n=5) | 1996 (n=5) | 1997 (n=16) | 1998 (n=3) | 1999 (n=6) | 2000 (n=12) | 2001 (n=13) | 2002 (n=29) | 2003 (n=7) | 2004 (n=31) | 2005 (n=2) | 2006 (n=3) | 2007 (n=6) | |
| AMP | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3.4 | 0 | 0 | 0 | 0 | 16.7 |
| FOX | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| CEF | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| CTX | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| CHL | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.7 | 0 | 0 | 0 | 0 | 0 |
| TET | 0 | 0 | 0 | 33.3 | 0 | 10 | 0 | 5.3 | 8.3 | 0 | 0 | 0 | 6.25 | 0 | 0 | 0 | 0 | 20.7 | 0 | 0 | 0 | 0 | 0 |
| AK | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| GEN | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 25 | 0 | 0 | 8.3 | 15.4 | 13.8 | 0 | 0 | 0 | 0 | 0 |
| STX | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.7 |
| CIP | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| NAL | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.8 | 0 | 0 | 0 | 0 | 0 | 0 | 25 | 0 | 20.7 | 57.1 | 74.2 | 50 | 33.3 | 16.7 |
| IPM | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| KAN | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8.3 | 7.7 | 0 | 0 | 0 | 0 | 0 | 0 |
| SSS | 0 | 0 | 0 | 0 | 0 | 0 | 25 | 0 | 2.8 | 0 | 0 | 0 | 6.25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16.7 |
| STR | 0 | 100 | 38.5 | 66.6 | 0 | 50 | 50 | 57.9 | 41.7 | 0 | 0 | 20 | 37.5 | 33.3 | 16.7 | 33.3 | 23.1 | 41.4 | 14.3 | 12.9 | 0 | 66.7 | 66.7 |
AMP, ampicillin; FOX, cefoxitin; CEF, cephalothin; CTX, cefotaxime; CHL, chloramphenicol; TET, tetracycline; AK, amikacin; GEN, gentamicin; STX, trimethoprim-sulphamethoxazole; CIP, ciprofloxacin; NAL, nalidixic acid; IPM, imipenem; KAN, kanamycin; SSS, sulphonamides; STR, streptomycin.