Influence of factors commonly known to be associated with health inequalities on antibiotic use in high-income countries: a systematic scoping review

Introduction: Inappropriate antibiotic use contributes to antimicrobial resistance. High-income countries have high rates of antibiotic use, with a prevalence of health inequalities amongst populations. Objectives: To understand the influence of factors commonly known to be associated with health inequalities on antibiotic use in high-income countries. Methods: Factors commonly known to be associated with health inequalities were defined as protected characteristics under UK's Equality Act (age, disability, gender reassignment, marriage and civil partnership, pregnancy and maternity, race/ethnicity, religion or belief, sex, sexual orientation), socioeconomic characteristics (income, insurance, employment status, deprivation, education), geography (urban versus rural, region) and vulnerable groups. The study followed PRISMA-ScR and, PRISMA-E statements. Results: Fifty-eight of 402 identified studies met inclusion criteria. Fifty of those papers (86%) included one or more protected characteristics, 37 (64%) socioeconomic characteristics, 21 (36%) geography and 6 (10%) vulnerable groups. Adults in older age groups, especially those in residential care, had the highest antibiotic use. The influence of race or ethnicity and antibiotic use was particular to country context. Areas of high deprivation had higher antibiotic use compared with areas of no or low deprivation, and geographical variation existed within countries. When faced with health system barriers, migrants relied on alternative routes of antibiotic supply other than prescription. Recommendations for future research: To investigate how factors and wider social determinants of health interplay and impact antibiotic use, using frameworks/approaches to reduce health inequalities such as England's Core20PLUS approach. Antimicrobial stewardship initiatives should equip healthcare professionals to review patients at the highest risk of antibiotic use.