Short- versus long-course therapy in gram-negative bacilli bloodstream infections

  • Adrian SousaEmail author
  • María Teresa Pérez-Rodríguez
  • Milagros Suárez
  • Nuria Val
  • Lucía Martínez-Lamas
  • Andrés Nodar
  • Rebeca Longueira
  • Manuel Crespo
Original Article


Bacteremia due to gram-negative bacilli (GNB) is one of the most frequent causes of admission and prolongation of hospital stay. Nevertheless, optimal duration of antibiotic treatment is not clearly established. We designed an observational, prospective study of a cohort of adult patients with uncomplicated GNB bacteremia. They were classified according to the duration of treatment in short (7–10 days) or long (> 10 days) course. Mortality and bacteremia recurrence rate were evaluated, and propensity score for receiving short-course treatment was calculated. A total of 395 patients met eligibility criteria including 232 and 163 who received long- and short-course therapy, respectively. Median age was 71 years, 215 (54.4% male) and 51% had a urinary source. Thirty-day mortality was 12%. In multivariate analysis by logistic regression stratified according to propensity score quartile for receiving short-course therapy showed no association of duration of treatment with 30-day mortality or 90-day recurrence rate. Based on the results observed in our cohort, short-course therapy could be as safe and effective as longer courses.


Bloodstream infection therapy Gram-negative bacteremia Shorter therapy Antimicrobial stewardship 



This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

The study was approved by the Local Ethics Committee (2017/336) which waived the need to obtain written informed consent.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Adrian Sousa
    • 1
    • 2
    Email author
  • María Teresa Pérez-Rodríguez
    • 1
    • 2
  • Milagros Suárez
    • 1
    • 2
  • Nuria Val
    • 1
    • 2
  • Lucía Martínez-Lamas
    • 3
  • Andrés Nodar
    • 1
    • 2
  • Rebeca Longueira
    • 1
    • 2
  • Manuel Crespo
    • 1
    • 2
  1. 1.Infectious Diseases Unit, Internal Medicine DepartmentHospital Álvaro Cunqueiro-Complejo Hospitalario Universitario de VigoVigoSpain
  2. 2.Instituto de Investigación Sanitaria Galicia Sur (IIS Galicia Sur)Hospital Álvaro Cunqueiro Bloque TécnicoVigoSpain
  3. 3.Microbiology Department, Hospital Álvaro CunqueiroComplejo Hospitalario Universitario de VigoVigoSpain

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