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Do antimicrobials increase the carriage rate of penicillin resistant pneumococci in children? Cross sectional prevalence study

^a Department of Family Medicine, Solvangur Health Centre, University of Iceland, IS-220 Hafnarfjordur, Iceland, ^b Department of Microbiology, Landspitalinn (University Hospital), IS-101 Reykjavik, Iceland, ^c Microbiology Laboratory, Borgarspitalinn (Reykjavik City Hospital), IS-108 Reykjavik, Iceland, ^d Hoor Health Centre, S-243 30 Hoor, Sweden, ^e Department of Internal Medicine, Landspitalinn, IS-101 Reykjavik

Correspondence to: Dr Arason.

Abstract

Objective: To study the correlation of antimicrobial consumption with the carriage rate of penicillin resistant and multiresistant pneumococci in children.
Design: Cross sectional and analytical prevalence study.
Setting: Five different communities in Iceland.
Main outcome measure: Prevalence of nasopharyngeal carriage of penicillin resistant pneumococci in children aged under 7 years in relation to antibiotic use as determined by information from parents, patient's records, and total sales of antimicrobials from local pharmacies in four study areas.
Results: Total antimicrobial sales for children (6223 prescriptions) among the four areas for which data were available ranged from 9.6 to 23.2 defined daily doses per 1000 children daily (1.1 to 2.6 courses yearly per child). Children under 2 consumed twice as much as 2-6 year olds (20.5 v 10.9 defined daily doses per 1000 children daily). Nasopharyngeal specimens were obtained from 919 children, representing 15-38% of the peer population groups in the different areas. Pneumococci were carried by 484 (52.7%) of the children, 47 (9.7%) of the isolates being resistant to penicillin or multiresistant. By multivariate analysis age (<2 years), area (highest antimicrobial consumption), and individual use of antimicrobials significantly influenced the odds of carrying penicillin resistant pneumococci. By univariate analysis, recent antimicrobial use (two to seven weeks) and use of co-trimoxazole were also significantly associated with carriage of penicillin resistant pneumococci.
Conclusions: Antimicrobial use, with regard to both individual use and total antimicrobial consumption in the community, is strongly associated with nasopharyngeal carriage of penicillin resistant pneumococci in children. Control measures to reduce the prevalence of penicillin resistant pneumococci should include reducing the use of antimicrobials in community health care.

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Antimicrobial use and resistance development in the community

Vilhjalmur Arason
bmj.com, 18 Dec 2007 [Full text]