Gellin, G Antibiotic resistance of gram-negative enteric bacteria from pigs in three herds with different histories of antibiotic exposure. [electronic resource] - Applied and environmental microbiology Sep 1989 - 2287-92 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0099-2240 Standard No.: 10.1128/aem.55.9.2287-2292.1989 doi Subjects--Topical Terms: AnimalsAnti-Bacterial Agents--pharmacologyBacterial Infections--drug therapyDrug Resistance, Microbial--geneticsEnterobacteriaceae--drug effectsFeces--microbiologyFermentationLactose--metabolismMicrobial Sensitivity TestsMutationRectum--microbiologySwine