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Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections
Surveillance for avian influenza viruses (AIVs) in poultry and environmental samples was conducted in four live-bird markets in Cambodia from January through November 2013. Through real-time RT-PCR testing, AIVs were detected in 45% of 1048 samples collected throughout the year. Detection rates rang...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5141262/ https://www.ncbi.nlm.nih.gov/pubmed/27436362 http://dx.doi.org/10.1038/emi.2016.69 |
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author | Horm, Srey Viseth Tarantola, Arnaud Rith, Sareth Ly, Sowath Gambaretti, Juliette Duong, Veasna Y, Phalla Sorn, San Holl, Davun Allal, Lotfi Kalpravidh, Wantanee Dussart, Philippe Horwood, Paul F Buchy, Philippe |
author_facet | Horm, Srey Viseth Tarantola, Arnaud Rith, Sareth Ly, Sowath Gambaretti, Juliette Duong, Veasna Y, Phalla Sorn, San Holl, Davun Allal, Lotfi Kalpravidh, Wantanee Dussart, Philippe Horwood, Paul F Buchy, Philippe |
author_sort | Horm, Srey Viseth |
collection | PubMed |
description | Surveillance for avian influenza viruses (AIVs) in poultry and environmental samples was conducted in four live-bird markets in Cambodia from January through November 2013. Through real-time RT-PCR testing, AIVs were detected in 45% of 1048 samples collected throughout the year. Detection rates ranged from 32% and 18% in duck and chicken swabs, respectively, to 75% in carcass wash water samples. Influenza A/H5N1 virus was detected in 79% of samples positive for influenza A virus and 35% of all samples collected. Sequence analysis of full-length haemagglutinin (HA) and neuraminidase (NA) genes from A/H5N1 viruses, and full-genome analysis of six representative isolates, revealed that the clade 1.1.2 reassortant virus associated with Cambodian human cases during 2013 was the only A/H5N1 virus detected during the year. However, multiplex reverse transcriptase-polymerase chain reaction (RT-PCR) analysis of HA and NA genes revealed co-circulation of at least nine low pathogenic AIVs from HA1, HA2, HA3, HA4, HA6, HA7, HA9, HA10 and HA11 subtypes. Four repeated serological surveys were conducted throughout the year in a cohort of 125 poultry workers. Serological testing found an overall prevalence of 4.5% and 1.8% for antibodies to A/H5N1 and A/H9N2, respectively. Seroconversion rates of 3.7 and 0.9 cases per 1000 person-months participation were detected for A/H5N1 and A/H9N2, respectively. Peak AIV circulation was associated with the Lunar New Year festival. Knowledge of periods of increased circulation of avian influenza in markets should inform intervention measures such as market cleaning and closures to reduce risk of human infections and emergence of novel AIVs. |
format | Online Article Text |
id | pubmed-5141262 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-51412622016-12-28 Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections Horm, Srey Viseth Tarantola, Arnaud Rith, Sareth Ly, Sowath Gambaretti, Juliette Duong, Veasna Y, Phalla Sorn, San Holl, Davun Allal, Lotfi Kalpravidh, Wantanee Dussart, Philippe Horwood, Paul F Buchy, Philippe Emerg Microbes Infect Original Article Surveillance for avian influenza viruses (AIVs) in poultry and environmental samples was conducted in four live-bird markets in Cambodia from January through November 2013. Through real-time RT-PCR testing, AIVs were detected in 45% of 1048 samples collected throughout the year. Detection rates ranged from 32% and 18% in duck and chicken swabs, respectively, to 75% in carcass wash water samples. Influenza A/H5N1 virus was detected in 79% of samples positive for influenza A virus and 35% of all samples collected. Sequence analysis of full-length haemagglutinin (HA) and neuraminidase (NA) genes from A/H5N1 viruses, and full-genome analysis of six representative isolates, revealed that the clade 1.1.2 reassortant virus associated with Cambodian human cases during 2013 was the only A/H5N1 virus detected during the year. However, multiplex reverse transcriptase-polymerase chain reaction (RT-PCR) analysis of HA and NA genes revealed co-circulation of at least nine low pathogenic AIVs from HA1, HA2, HA3, HA4, HA6, HA7, HA9, HA10 and HA11 subtypes. Four repeated serological surveys were conducted throughout the year in a cohort of 125 poultry workers. Serological testing found an overall prevalence of 4.5% and 1.8% for antibodies to A/H5N1 and A/H9N2, respectively. Seroconversion rates of 3.7 and 0.9 cases per 1000 person-months participation were detected for A/H5N1 and A/H9N2, respectively. Peak AIV circulation was associated with the Lunar New Year festival. Knowledge of periods of increased circulation of avian influenza in markets should inform intervention measures such as market cleaning and closures to reduce risk of human infections and emergence of novel AIVs. Nature Publishing Group 2016-07 2016-07-20 /pmc/articles/PMC5141262/ /pubmed/27436362 http://dx.doi.org/10.1038/emi.2016.69 Text en Copyright © 2016 Shanghai Shangyixun Cultural Communication Co., Ltd http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Original Article Horm, Srey Viseth Tarantola, Arnaud Rith, Sareth Ly, Sowath Gambaretti, Juliette Duong, Veasna Y, Phalla Sorn, San Holl, Davun Allal, Lotfi Kalpravidh, Wantanee Dussart, Philippe Horwood, Paul F Buchy, Philippe Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections |
title | Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections |
title_full | Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections |
title_fullStr | Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections |
title_full_unstemmed | Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections |
title_short | Intense circulation of A/H5N1 and other avian influenza viruses in Cambodian live-bird markets with serological evidence of sub-clinical human infections |
title_sort | intense circulation of a/h5n1 and other avian influenza viruses in cambodian live-bird markets with serological evidence of sub-clinical human infections |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5141262/ https://www.ncbi.nlm.nih.gov/pubmed/27436362 http://dx.doi.org/10.1038/emi.2016.69 |
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