TABLE 1.

Anamnestic information about the flocks sampled

FlockType of animalsAge (days)Antimicrobial treatment historyAntimicrobial treatment history of the preceding flockNo. of isolates included in the study
1Broilers35NoneOxytetracycline, sulfadiazine-trimethoprim19
2Broilers12AmoxicillinFlumequine, amoxicillin, sulfadiazine-trimethoprim, colistin19
4Broilers70Enrofloxacin, tylosinNone14
5Broilers35AmoxicillinAmoxicillin5
6Parents240Tylosin, tetracycline, colistinTylosin, tetracycline, colistin10