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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Primary Care Influenza-like Illness Surveillance in Ho Chi Minh City, Vietnam 2013-2015
AU - Todd, Stacy
AU - Huong, Nguyen Thi Cam
AU - Thanh, Nguyen Thi Le
AU - Vy, Nguyen Ha Thao
AU - Hung, Nguyen Thanh
AU - Thao, Tran Thi Nhu
AU - Phuong, Huynh Thi
AU - van Doorn, H Rogier
AU - Hang, V T Ty
AU - Chau, Nguyen Van Vinh
AU - Read, Jonathan M
AU - Lalloo, David G
AU - Boni, Maciej F
N1 - This article is protected by copyright. All rights reserved.
PY - 2018/9
Y1 - 2018/9
N2 - BACKGROUND: Year-round transmission of influenza has been detected in Vietnam through both national surveillance and other epidemiological studies. Understanding the demographic and clinical features of influenza-like-illness (ILI) presenting to primary care in urban Vietnam is vital to understand these transmission dynamics.METHODS: A prospective, observational study of patients with ILI in Ho Chi Minh City, Vietnam was conducted between August 2013 and November 2015 in a mix of public and private primary care settings. Molecular testing for Influenza A & B and 12 other respiratory viruses was performed.RESULTS: 1152 ILI patients were recruited. 322 and 136 subjects tested positive for influenza A and B, respectively. 193 subjects tested positive for another respiratory virus; most commonly rhinovirus and parainfluenza virus 3. Influenza was detected in 81% of the 116 study weeks. Three peaks of influenza activity were detected; an H3N2 peak April-June 2014, an influenza B peak July-December 2014, and a mixed H3N2 and H1N1 peak March-September 2015. Subjects recruited from private clinics were more likely to have higher income, and to have reported previous influenza vaccination. Antibiotic use was common (50.3%) despite limited evidence of bacterial infection.CONCLUSION: Influenza in southern Vietnam has complex transmission dynamics including periods of intense influenza activity of alternating types and subtypes. Broadening surveillance from hospital to the community in tropical settings is feasible and a valuable for improving our understanding of the global spread and evolution of the virus. This article is protected by copyright. All rights reserved.
AB - BACKGROUND: Year-round transmission of influenza has been detected in Vietnam through both national surveillance and other epidemiological studies. Understanding the demographic and clinical features of influenza-like-illness (ILI) presenting to primary care in urban Vietnam is vital to understand these transmission dynamics.METHODS: A prospective, observational study of patients with ILI in Ho Chi Minh City, Vietnam was conducted between August 2013 and November 2015 in a mix of public and private primary care settings. Molecular testing for Influenza A & B and 12 other respiratory viruses was performed.RESULTS: 1152 ILI patients were recruited. 322 and 136 subjects tested positive for influenza A and B, respectively. 193 subjects tested positive for another respiratory virus; most commonly rhinovirus and parainfluenza virus 3. Influenza was detected in 81% of the 116 study weeks. Three peaks of influenza activity were detected; an H3N2 peak April-June 2014, an influenza B peak July-December 2014, and a mixed H3N2 and H1N1 peak March-September 2015. Subjects recruited from private clinics were more likely to have higher income, and to have reported previous influenza vaccination. Antibiotic use was common (50.3%) despite limited evidence of bacterial infection.CONCLUSION: Influenza in southern Vietnam has complex transmission dynamics including periods of intense influenza activity of alternating types and subtypes. Broadening surveillance from hospital to the community in tropical settings is feasible and a valuable for improving our understanding of the global spread and evolution of the virus. This article is protected by copyright. All rights reserved.
KW - epidemiology
KW - human
KW - influenza
KW - primary health care
KW - Vietnam
U2 - 10.1111/irv.12574
DO - 10.1111/irv.12574
M3 - Journal article
C2 - 29858879
VL - 12
SP - 623
EP - 631
JO - Influenza and Other Respiratory Viruses
JF - Influenza and Other Respiratory Viruses
SN - 1750-2640
IS - 5
ER -