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SARS transmission in Vietnam outside of the health-care setting

Published online by Cambridge University Press:  26 July 2006

P. A. TUAN ,
P. HORBY ,
P. N. DINH ,
L. T. Q. MAI ,
M. ZAMBON ,
J. SHAH ,
V. Q. HUY ,
S. BLOOM ,
R. GOPAL  and
J. COMER
...Show all authors
P. A. TUAN
Affiliation:
National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
P. HORBY
Affiliation:
World Health Organization, Hanoi, Vietnam
P. N. DINH
Affiliation:
National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
L. T. Q. MAI
Affiliation:
National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
M. ZAMBON
Affiliation:
Health Protection Agency, London, UK
J. SHAH
Affiliation:
Centers for Disease Control and Prevention, Atlanta, GA, USA
V. Q. HUY
Affiliation:
French Hospital, Hanoi, Vietnam
S. BLOOM
Affiliation:
Centers for Disease Control and Prevention, Atlanta, GA, USA
R. GOPAL
Affiliation:
Health Protection Agency, London, UK
J. COMER
Affiliation:
Centers for Disease Control and Prevention, Atlanta, GA, USA
A. PLANT
Affiliation:
Curtin University of Technology, Australia
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Abstract

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To evaluate the risk of transmission of SARS coronavirus outside of the health-care setting, close household and community contacts of laboratory-confirmed SARS cases were identified and followed up for clinical and laboratory evidence of SARS infection. Individual- and household-level risk factors for transmission were investigated. Nine persons with serological evidence of SARS infection were identified amongst 212 close contacts of 45 laboratory- confirmed SARS cases (secondary attack rate 4·2%, 95% CI 1·5–7). In this cohort, the average number of secondary infections caused by a single infectious case was 0·2. Two community contacts with laboratory evidence of SARS coronavirus infection had mild or sub-clinical infection, representing 3% (2/65) of Vietnamese SARS cases. There was no evidence of transmission of infection before symptom onset. Physically caring for a symptomatic laboratory-confirmed SARS case was the only independent risk factor for SARS transmission (OR 5·78, 95% CI 1·23–24·24).

Type
Research Article
Information
Epidemiology & Infection , Volume 135 , Issue 3 , April 2007 , pp. 392 - 401
Copyright
2006 Cambridge University Press