in particular: amoxicillin/clavulanic
acid (20% vs. 12%); ampicillin (44% vs. 23%); cefaclor (15% vs. 8%);
ciprofloxacin (5% vs. 0.4%); enrofloxacin (7% vs. 1%); neomycin (9% vs.
2%); piperacillin (31% vs. 13%), and sulfamethoxazole/trimethoprim
(47% vs. 18%).