antibiotic agent Article 77 human 74 male 50 female 49 adult 44 controlled study 36 major clinical study 34 nonhuman 30 Humans 25 retrospective study 22 aged 21 antibiotic therapy 20 middle aged 19 antibiotic resistance 17 clinical article 15 fever 15 Female 14 antiinfective agent 14 cohort analysis 13 drug use 13 follow up 13 gentamicin 13 prescription 13 unclassified drug 13 Male 12 child 12 Anti-Bacterial Agents 11 Middle Aged 11 urinary tract infection 11