title: Co-Colonization with Neisseria species Is a Risk Factor for Prolonged Colonization with Multidrug-Resistant Acinetobacter baumannii in the Respiratory Tract.
abstract: Multidrug-resistant Acinetobacter baumannii (MDRAB) colonization increases the risk of bacterial spread in the hospital setting. The impact of clinical factors, including antibiotic use, on prolongation of MDRAB colonization has not been investigated. Patients with respiratory tract MDRAB detected using culture were enrolled in this study. Long-term colonizers and short-term colonizers were defined as patients whose colonization periods were >30 days or ≤30 days, respectively. Clinical data were abstracted from medical records. MDRAB was isolated in 34 patients. There were 13 long-term colonizers and 9 short-term colonizers. Twelve patients were lost to follow-up and excluded from the study. There were no significant differences in average leukocyte counts, numbers of antibiotic classes administered, duration of antibiotic use in the 30 days following colonization, or rates of central catheterization or mechanical ventilation between the 2 groups. Long-term colonizers carried Neisseria species (spp.) more frequently in the 30 days following colonization than short-term colonizers (7/13 vs 1/9, p = 0.01); however, this was not the case prior to colonization with MDRAB (5/13 vs 1/9, p = 0.33). The 90-day MDRAB colonization rates for Neisseria-negative patients and Neisseria-positive patients were 10.0% and 83.3%, respectively (P < 0.01). Prolonged MDRAB colonization in the respiratory tract was associated with Neisseria spp. co-colonization.
authors.affiliation: Department of Internal Medicine, Teikyo University.
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Kitazawa
authors.forename: Kazunori
authors.initials: K
authors.lastname: Seo
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yoshino
authors.forename: Ichiro
authors.initials: I
authors.lastname: Koga
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Ota
mesh_terms: D000151:Acinetobacter Infections / Q000150:complications* / Q000453:epidemiology / Q000382:microbiology; D040981:Acinetobacter baumannii / Q000187:drug effects / Q000302:isolation & purification*; D000368:Aged; D000369:Aged, 80 and over; D002353:Carrier State / Q000453:epidemiology / Q000382:microbiology; D060085:Coinfection / Q000150:complications* / Q000453:epidemiology / Q000382:microbiology; D024901:Drug Resistance, Multiple, Bacterial; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009343:Neisseria / Q000145:classification / Q000302:isolation & purification*; D016870:Neisseriaceae Infections / Q000150:complications* / Q000453:epidemiology / Q000382:microbiology; D015995:Prevalence; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000382:microbiology*; D012307:Risk Factors