Ann Lab Med 2018; 38(3): 266-270  
Seasonal and Temperature-Associated Increase in Community-Onset Acinetobacter baumannii Complex Colonization or Infection
Young Ah Kim, M.D.1, Jin Ju Kim, M.D.2, Dong Ju Won, M.D.3, and Kyungwon Lee, M.D.3,4
Department of Laboratory Medicine1, National Health Insurance Service Ilsan Hospital, Goyang; Department of Laboratory Medicine2, Inha University College of Medicine, Incheon; Department of Laboratory Medicine3 and Research Institute of Bacterial Resistance4, Yonsei University College of Medicine, Seoul, Korea
Corresponding author: Kyungwon Lee
Department of Laboratory Medicine and Research Institute of Bacterial Resistance, Severance Hospital, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
Tel: +82-2-2228-2446
Fax: +82-2-313-0956
Received: June 14, 2017; Revised: August 17, 2017; Accepted: January 5, 2018; Published online: May 1, 2018.
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Identifying the trends in community-onset Acinetobacter baumannii complex isolation and diversity according to temperature could help provide insight into the behavior of the A. baumannii complex. We performed a retrospective analysis of A. baumannii complex (Acinetobacter baumannii, Acinetobacter nosocomialis, Acinetobacter pittii, and Acinetobacter calcoaceticus) isolates obtained from patients at a Korean community hospital from 2006 to 2015 with reference to seasonal temperatures. The incidence rates were compared between warm (June–September) and cold (November–March) months, defined as an average mean temperature ≥20°C and ≤5°C, respectively. Incidence rate was calculated as the number of cases per month, converted to cases/105 admissions for healthcare-acquired isolates and cases/103 outpatients for community-onset isolates. Approximately 3,500 A. baumannii complex cases were identified, and 26.2% of them were community-onset cases. The median (interquartile range) number of community-onset A. baumannii complex cases was significantly higher (P =0.0002) in warm months at 13.8 (9.5–17.6) than in cold months at 10.1 (6.3–13.2). There was a strong correlation between community-onset A. baumannii complex cases and temperature (Pearson’s r=0.6805, P =0.0149). Thus, we identified a seasonality pattern for community-onset A. baumannii complex colonization or infection, but not for healthcare-acquired cases.
Keywords: Acinetobacter baumannii complex, Community-onset, Seasonality

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