Outbreaks of Middle East Respiratory Syndrome in Two Hospitals Initiated by a Single Patient in Daejeon, South Korea

被引:36
作者
Park, Sun Hee [1 ]
Kim, Yeon-Sook [2 ]
Jung, Younghee [3 ]
Choi, Soo Young [4 ]
Cho, Nam-Hyuk [5 ,6 ]
Jeong, Hye Won [7 ]
Heo, Jung Yeon [7 ]
Yoon, Ji Hyun [8 ]
Lee, Jacob [9 ]
Cheon, Shinhye [2 ]
Sohn, Kyung Mok [2 ]
机构
[1] Catholic Univ Korea, Div Infect Dis, Dept Internal Med, Coll Med, Seoul, South Korea
[2] Chungnam Natl Univ, Div Infect Dis, Dept Internal Med, Sch Med, Munhwa Ro 282, Daejeon 35015, South Korea
[3] Hallym Sacred Heart Hosp, Dept Internal Med, Div Infect Dis, Anayang, South Korea
[4] Dae Chung Hosp, Dept Neurol, Daejeon, South Korea
[5] Seoul Natl Univ, Coll Med, Dept Biomed Sci, Dept Microbiol & Immunol, Seoul, South Korea
[6] Bundang Hosp, Seoul, South Korea
[7] Chungbuk Natl Univ, Div Infect Dis, Dept Internal Med, Coll Med, Cheongju, South Korea
[8] Eulji Univ Hosp, Div Infect Dis, Dept Internal Med, Daejeon, South Korea
[9] Hallym Univ, Coll Med, Dept Internal Med, Div Infect Dis, Seoul, South Korea
关键词
Middle East Respiratory Syndrome coronavirus; Hospital; Outbreak; Superspreading; Daejeon; South Korea;
D O I
10.3947/ic.2016.48.2.99
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
Background: A Middle East Respiratory Syndrome coronavirus (MERS-CoV) outbreak in South Korea in 2015 started by a single imported case and was amplified by intra-and inter-hospital transmission. We describe two hospital outbreaks of MERS-CoV infection in Daejeon caused by a single patient who was infected by the first Korean case of MERS. Materials and Methods: Demographic and clinical information involving MERS cases in the Daejeon cluster were retrospectively collected and potential contacts and exposures were assessed. The incubation periods and serial intervals were estimated. Viral RNAs were extracted from respiratory tract samples obtained from the index case, four secondary cases and one tertiary case from each hospital. The partial S2 domain of the MERS-CoV spike was sequenced. Results: In Daejeon, a MERS patient (the index case) was hospitalized at Hospital A in the first week of illness and was transferred to Hospital B because of pneumonia progression in the second week of illness, where he received a bronchoscopic examination and nebulizer therapy. A total of 23 secondary cases (10 in Hospital A and 13 in Hospital B) were detected among patients and caregivers who stayed on the same ward with the index case. There were no secondary cases among healthcare workers. Among close hospital contacts, the secondary attack rate was 15.8% (12/76) in Hospital A and 14.3% (10/70) in Hospital B. However, considering the exposure duration, the incidence rate was higher in Hospital B (7.7/100 exposure-days) than Hospital A (3.4/100 exposure-days). In Hospital B, the median incubation period was shorter (4.6 days vs. 10.8 days), the median time to pneumonia development was faster (3 days vs. 6 days) and mortality was higher (70% vs. 30.8%) than in Hospital A. MERS-CoV isolates from 11 cases formed a single monophyletic clade, with the closest similarity to strains from Riyadh. Conclusion: Exposure to the MERS case in the late stage (2nd week) of diseases appeared to increase the risk of transmission and was associated with shorter incubation periods and rapid disease progression among those infected. Early detection and isolation of cases is critical in preventing the spread of MERS in the hospital and decreasing the disease severity among those infected.
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收藏
页码:99 / 107
页数:9
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