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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/25386

Title: Amoxicillin for acute lower respiratory tract infection in primary care: subgroup analysis by bacterial and viral aetiology
Authors: Bruyndonckx, Robin
Stuart, Beth
Little, Paul
Hens, Niel
Ieven, Margaretha
Butler, Christopher
Verheij, Theo
Goossens, Herman
Coenen, Samuel
Issue Date: 2017
Citation: Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases,
Status: In Press
Abstract: Objective We aimed to assess the effects of amoxicillin treatment in adult patients presenting to primary care with a lower respiratory tract infection (LRTI) who were infected with a potential bacterial, viral, or mixed bacterial/viral infection. Methods This multicentre randomized controlled trial focused on adults with LRTI not suspected for pneumonia. Patients were randomized to receive either antibiotic (amoxicillin 1 g) or placebo three times daily for 7 consecutive days using computer-generated random numbers (follow-up 28 days). In this secondary analysis of the trial, symptom duration (primary outcome), symptom severity (scored 0–6), and illness deterioration (reconsultation with new or worsening symptoms, or hospital admission) were analysed in pre-specified subgroups using regression models. Subgroups of interest were patients with a (strictly) bacterial, (strictly) viral, or combined infection, and patients with elevated values of procalcitonin, C-reactive protein, or blood urea nitrogen. Results 2058 patients (amoxicillin n = 1036; placebo n = 1022) were randomized. Treatment did not affect symptom duration (n = 1793). Patients from whom a bacterial pathogen only was isolated (n = 207) benefited from amoxicillin in that symptom severity (n = 804) was reduced by 0.26 points (95% CI −0.48 to −0.03). The odds of illness deterioration (n = 2024) was 0.24 (95% CI 0.11 to 0.53) times lower from treatment with amoxicillin when both a bacterial and a viral pathogen were isolated (combined infection; n = 198). Conclusions Amoxicillin may reduce the risk of illness deterioration in patients with a combined bacterial and viral infection. We found no clinically meaningful benefit from amoxicillin treatment in other subgroups.
URI: http://hdl.handle.net/1942/25386
DOI: 10.1016/j.cmi.2017.10.032
ISSN: 1198-743X
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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