A 16-Year Prospective Study of Community-Onset Bacteremic Acinetobacter Pneumonia: Low mortality with appropriate initial empirical antibiotic protocols

Joshua Davis, Mark McMillan, Ashwin Swaminathan, John Kelly, Kim Piera, Robert Baird, Bart Currie, Nicholas Anstey

    Research output: Contribution to journalArticle

    Abstract

    Background: The genus Acinetobacter , well known as a nosocomial pathogen, can also cause severe community-onset pneumonia. Previous small case series have suggested fulminant disease and a pooled hospital mortality of > 60%.

    Methods: We conducted a prospective observational study of all episodes of bacteremic, community-onset, and radiologically confirmed pneumonia due to Acinetobacter species at a tertiary referral hospital in tropical Australia from 1997 to 2012 following the introduction of routine empirical treatment protocols covering Acinetobacter . Demographic, clinical, microbiologic, and outcome data were collected.

    Results: There were 41 episodes of bacteremic community-onset Acinetobacter pneumonia, of which 36 had no indicators suggesting health-care-associated infection. Of these, 38 (93%) were Indigenous Australians, one-half were men, the average age was 44.1 years, and 36 episodes (88%) occurred during the rainy season. All patients had at least one risk factor, with hazardous alcohol intake in 82%. Of the 37 isolates available for molecular speciation, 35 were Acinetobacter baumannii and two were Acinetobacter nosocomialis . All isolates were susceptible in vitro to gentamicin, meropenem, and ciprofloxacin, but only one was fully susceptible to ceft riaxone. ICU admission was required in 80%. All 41 patients received appropriate antibiotics within the first 24 h of admission, and 28- and 90-day mortality were both low at 11%.

    Conclusions: Community-acquired Acinetobacter pneumonia is a severe disease, with the majority of patients requiring ICU admission. Most patients have risk factors, particularly hazardous alcohol use. Despite this severity, correct initial empirical antibiotic therapy in all patients was associated with low mortality.
    Original languageEnglish
    Pages (from-to)1038-1045
    Number of pages8
    JournalChest
    Volume146
    Issue number4
    DOIs
    Publication statusPublished - 2014

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