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Assessing evidence for avian-to-human transmission of influenza A/H9N2 virus in rural farming communities in northern Vietnam.

Abstract Rural farming communities in northern Vietnam do not routinely practice vaccination for influenza A viruses (IAV) for either humans or poultry, which enables us to study transmission intensity via seroepidemiology. Using samples from a longitudinal cohort of farming households, we determined the number of symptomatic and asymptomatic human infections for seasonal IAV and avian A/H9 over 2 years. As expected, we detected virologically confirmed acute cases of seasonal IAV in humans, as well as large numbers of subclinical seroconversions to A/H1pdm [55/265 (21 %)], A/H3 [95/265 (36 %)] and A/H9 [24/265 (9 %)]. Five of the A/H9 human seroconverters likely represented true infections rather than heterosubtypic immunity, because the individuals seroconverted solely to A/H9. Among co-located poultry, we found significantly higher seroprevalance for A/H5 compared to A/H9 in both chickens and ducks [for northern study sites overall, 337/1105 (30.5 %) seropositive for A/H5 and 123/1105 (11.1 %) seropositive for A/H9].
PMID
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Authors

Mayor MeshTerms
Keywords
Journal Title the journal of general virology
Publication Year Start




PMID- 28771136
OWN - NLM
STAT- In-Process
DA  - 20170803
LR  - 20170828
IS  - 1465-2099 (Electronic)
IS  - 0022-1317 (Linking)
VI  - 98
IP  - 8
DP  - 2017 Aug
TI  - Assessing evidence for avian-to-human transmission of influenza A/H9N2 virus in
      rural farming communities in northern Vietnam.
PG  - 2011-2016
LID - 10.1099/jgv.0.000877 [doi]
AB  - Rural farming communities in northern Vietnam do not routinely practice
      vaccination for influenza A viruses (IAV) for either humans or poultry, which
      enables us to study transmission intensity via seroepidemiology. Using samples
      from a longitudinal cohort of farming households, we determined the number of
      symptomatic and asymptomatic human infections for seasonal IAV and avian A/H9
      over 2 years. As expected, we detected virologically confirmed acute cases of
      seasonal IAV in humans, as well as large numbers of subclinical seroconversions
      to A/H1pdm [55/265 (21 %)], A/H3 [95/265 (36 %)] and A/H9 [24/265 (9 %)]. Five of
      the A/H9 human seroconverters likely represented true infections rather than
      heterosubtypic immunity, because the individuals seroconverted solely to A/H9.
      Among co-located poultry, we found significantly higher seroprevalance for A/H5
      compared to A/H9 in both chickens and ducks [for northern study sites overall,
      337/1105 (30.5 %) seropositive for A/H5 and 123/1105 (11.1 %) seropositive for
      A/H9].
FAU - Hoa, Le Nguyen Minh
AU  - Hoa LNM
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - Tuan, Nguyen Anh
AU  - Tuan NA
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - My, Pham Ha
AU  - My PH
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - Huong, Tran Thi Kieu
AU  - Huong TTK
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - Chi, Nguyen Thi Yen
AU  - Chi NTY
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - Hau Thu, Trang Thi
AU  - Hau Thu TT
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - Carrique-Mas, Juan
AU  - Carrique-Mas J
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam.
FAU - Duong, Mai Thuy
AU  - Duong MT
AD  - 2National Center for Veterinary Diagnostics, Hanoi, Vietnam.
FAU - Tho, Nguyen Dang
AU  - Tho ND
AD  - 2National Center for Veterinary Diagnostics, Hanoi, Vietnam.
FAU - Hoang, Nguyen Dang
AU  - Hoang ND
AD  - 2National Center for Veterinary Diagnostics, Hanoi, Vietnam.
FAU - Thanh, To Long
AU  - Thanh TL
AD  - 2National Center for Veterinary Diagnostics, Hanoi, Vietnam.
FAU - Diep, Nguyen Thi
AU  - Diep NT
AD  - 3Department of Animal Health, Epidemiology Division, Hanoi, Vietnam.
FAU - Duong, Nguyen van
AU  - Duong NV
AD  - 4District Veterinary Services, BaVi District, Subdepartment of Animal Health,
      Hanoi province, Vietnam.
FAU - Toan, Tran Khanh
AU  - Toan TK
AD  - 5Hanoi Medical University, Hanoi, Vietnam.
FAU - Tung, Trinh Son
AU  - Tung TS
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam 6National Institute Hygiene and Epidemiology, Hanoi, Vietnam.
FAU - Mai, Le Quynh
AU  - Mai LQ
AD  - 6National Institute Hygiene and Epidemiology, Hanoi, Vietnam.
FAU - Iqbal, Munir
AU  - Iqbal M
AD  - 7The Pirbright Insitute, UK.
FAU - Wertheim, Heiman
AU  - Wertheim H
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam 8Radboud University, Nijmegen, Netherlands.
FAU - van Doorn, H Rogier
AU  - van Doorn HR
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam 9Nuffield Department of Medicine, Centre for Tropical Medicine,
      University of Oxford, Oxford, UK.
FAU - Bryant, Juliet E
AU  - Bryant JE
AD  - 1Oxford University Clinical Research Unit, Hospital for Tropical Diseases,
      Vietnam 9Nuffield Department of Medicine, Centre for Tropical Medicine,
      University of Oxford, Oxford, UK.
FAU - The Vizions Consortium
AU  - The Vizions Consortium
LA  - eng
PT  - Journal Article
DEP - 20170804
PL  - England
TA  - J Gen Virol
JT  - The Journal of general virology
JID - 0077340
EDAT- 2017/08/05 06:00
MHDA- 2017/08/05 06:00
CRDT- 2017/08/04 06:00
AID - 10.1099/jgv.0.000877 [doi]
PST - ppublish
SO  - J Gen Virol. 2017 Aug;98(8):2011-2016. doi: 10.1099/jgv.0.000877. Epub 2017 Aug
      4.