Antibiotic Exposure and Other Risk Factors for Antimicrobial Resistance in Nasal Commensal Staphylococcus aureus: An Ecological Study in 8 European Countries

• Published in: PloS one 2015-08, Vol.10 (8), p.e0135094-e0135094
• Main Authors: van Bijnen, Evelien M E, Paget, John, de Lange-de Klerk, Elly S M, den Heijer, Casper D J, Versporten, Ann, Stobberingh, Ellen E, Goossens, Herman, Schellevis, François G
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Aged; Aged, 80 and over; Anti-Infective Agents - pharmacology; Anti-Infective Agents - therapeutic use; Antibiotics; Antiinfectives and antibacterials; Antimicrobial resistance; Bacterial infections; Carrier State - microbiology; Child; Drug resistance; Ecological risk assessment; Ecological studies; Electronic health records; Electronic medical records; Ethics; Europe - epidemiology; Exposure; Family medicine; Female; Health aspects; Health care; Health risks; Humans; Infection; Male; Medical research; Microbial drug resistance; Microbial Sensitivity Tests; Middle Aged; Multidrug resistance; Nasal Mucosa - microbiology; Penicillin; Public health; Resistance factors; Risk analysis; Risk Factors; Staphylococcal Infections - epidemiology; Staphylococcal Infections - microbiology; Staphylococcus aureus; Staphylococcus aureus - drug effects; Staphylococcus aureus infections; Staphylococcus infections; Young Adult
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0135094

Antimicrobial resistance (AMR) has become a global public health concern which threatens the effective treatment of bacterial infections. Resistant Staphylococcus aureus (including MRSA) increasingly appears in individuals with no healthcare associated risks. Our study assessed risk factors for nasal carriage of resistant S. aureus in a multinational, healthy, community-based population, including ecological exposure to antibiotics. Data were collected in eight European countries (Austria, Belgium, Croatia, France, Hungary, the Netherlands, Spain and Sweden). Commensal AMR patterns were assessed by collecting 28,929 nasal swabs from healthy persons (aged 4+). Ecological exposure to antibiotics was operationalized as systemic antibiotic treatment patterns, extracted from electronic medical records of primary care practices in which the participants were listed (10-27 per country). A multilevel analysis related AMR in nasal commensal S. aureus to antibiotic exposure and other risk factors (e.g. age and profession). Of the 6,093 S. aureus isolates, 77% showed resistance to at least one antibiotic. 7.1% exhibited multidrug resistance (defined as resistance to 3 or more antibiotic classes), and we found 78 cases MRSA (1.3%). A large variation in antibiotic exposure was found between and within countries. Younger age and a higher proportion of penicillin prescriptions in a practice were associated with higher odds for carriage of a resistant S. aureus. Also, we found higher multidrug resistance rates in participants working in healthcare or nurseries. This study indicates that in a population with no recent antibiotic use, the prescription behavior of the general practitioner affects the odds for carriage of a resistant S. aureus, highlighting the need for cautious prescribing in primary care. Finally, since variation in AMR could partly be explained on a national level, policy initiatives to decrease AMR should be encouraged at the national level within Europe.