Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012
Abstract Background Over the last decade, capacity for influenza surveillance and research in West Africa has strengthened. Data from these surveillance systems showed influenza A(H1N1)pdm09 circulated in West Africa later than in other regions of the continent. Methods We contacted 11 West African...
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| Language: | English |
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BMC
2017-12-01
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| Series: | BMC Infectious Diseases |
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| Online Access: | http://link.springer.com/article/10.1186/s12879-017-2839-1 |
| _version_ | 1818408344203821056 |
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| author | Ndahwouh Talla Nzussouo Jazmin Duque Adebayo Abel Adedeji Daouda Coulibaly Samba Sow Zekiba Tarnagda Issaka Maman Adamou Lagare Sonia Makaya Mohamed Brahim Elkory Herve Kadjo Adje Paul Alhassan Shilo Boubou Tamboura Assana Cisse Kossi Badziklou Halima Boubacar Maïnassara Ahmed Ould Bara Adama Mamby Keita Thelma Williams Ann Moen Marc-Alain Widdowson Meredith McMorrow |
| author_facet | Ndahwouh Talla Nzussouo Jazmin Duque Adebayo Abel Adedeji Daouda Coulibaly Samba Sow Zekiba Tarnagda Issaka Maman Adamou Lagare Sonia Makaya Mohamed Brahim Elkory Herve Kadjo Adje Paul Alhassan Shilo Boubou Tamboura Assana Cisse Kossi Badziklou Halima Boubacar Maïnassara Ahmed Ould Bara Adama Mamby Keita Thelma Williams Ann Moen Marc-Alain Widdowson Meredith McMorrow |
| author_sort | Ndahwouh Talla Nzussouo |
| collection | DOAJ |
| description | Abstract Background Over the last decade, capacity for influenza surveillance and research in West Africa has strengthened. Data from these surveillance systems showed influenza A(H1N1)pdm09 circulated in West Africa later than in other regions of the continent. Methods We contacted 11 West African countries to collect information about their influenza surveillance systems (number of sites, type of surveillance, sampling strategy, populations sampled, case definitions used, number of specimens collected and number of specimens positive for influenza viruses) for the time period January 2010 through December 2012. Results Of the 11 countries contacted, 8 responded: Burkina Faso, Cote d’Ivoire, Mali, Mauritania, Niger, Nigeria, Sierra Leone and Togo. Countries used standard World Health Organization (WHO) case definitions for influenza-like illness (ILI) and severe acute respiratory illness (SARI) or slight variations thereof. There were 70 surveillance sites: 26 SARI and 44 ILI. Seven countries conducted SARI surveillance and collected 3114 specimens of which 209 (7%) were positive for influenza viruses. Among influenza-positive SARI patients, 132 (63%) were influenza A [68 influenza A(H1N1)pdm09, 64 influenza A(H3N2)] and 77 (37%) were influenza B. All eight countries conducted ILI surveillance and collected 20,375 specimens, of which 2278 (11%) were positive for influenza viruses. Among influenza-positive ILI patients, 1431 (63%) were influenza A [820 influenza A(H1N1)pdm09, 611 influenza A(H3N2)] and 847 (37%) were influenza B. A majority of SARI and ILI case-patients who tested positive for influenza (72% SARI and 59% ILI) were children aged 0–4 years, as were a majority of those enrolled in surveillance. The seasonality of influenza and the predominant influenza type or subtype varied by country and year. Conclusions Influenza A(H1N1)pdm09 continued to circulate in West Africa along with influenza A(H3N2) and influenza B during 2010–2012. Although ILI surveillance systems produced a robust number of samples during the study period, more could be done to strengthen surveillance among hospitalized SARI case-patients. Surveillance systems captured young children but lacked data on adults and the elderly. More data on risk groups for severe influenza in West Africa are needed to help shape influenza prevention and clinical management policies and guidelines. |
| first_indexed | 2024-12-14T09:42:14Z |
| format | Article |
| id | doaj.art-ef984f966aa1474a8d91bafe95904eb0 |
| institution | Directory Open Access Journal |
| issn | 1471-2334 |
| language | English |
| last_indexed | 2024-12-14T09:42:14Z |
| publishDate | 2017-12-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Infectious Diseases |
| spelling | doaj.art-ef984f966aa1474a8d91bafe95904eb02022-12-21T23:07:45ZengBMCBMC Infectious Diseases1471-23342017-12-011711810.1186/s12879-017-2839-1Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012Ndahwouh Talla Nzussouo0Jazmin Duque1Adebayo Abel Adedeji2Daouda Coulibaly3Samba Sow4Zekiba Tarnagda5Issaka Maman6Adamou Lagare7Sonia Makaya8Mohamed Brahim Elkory9Herve Kadjo Adje10Paul Alhassan Shilo11Boubou Tamboura12Assana Cisse13Kossi Badziklou14Halima Boubacar Maïnassara15Ahmed Ould Bara16Adama Mamby Keita17Thelma Williams18Ann Moen19Marc-Alain Widdowson20Meredith McMorrow21Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and PreventionInfluenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and PreventionNational Influenza Reference Laboratory, Federal Ministry of HealthInstitut National d’Hygiene Publique (INHP)Centre National d’Appui à la Lutte Contre la Maladie (CNAM), Centre pour le Développement des Vaccins du Mali (CVD)Institut de Recherche en Sciences de Santé (IRSS)Institut National d’Hygiene (INH)Centre de Recherche Médicale et Sanitaire (CERMES)Influenza National Reference Laboratory LakkaInstitut National Recherche en Sante Publique (INRSP)Institut Pasteur Cȏte d’Ivoire (IPCI)National Influenza Reference Laboratory, Federal Ministry of HealthCentre National d’Appui à la Lutte Contre la Maladie (CNAM), Centre pour le Développement des Vaccins du Mali (CVD)Institut de Recherche en Sciences de Santé (IRSS)Institut National d’Hygiene (INH)Centre de Recherche Médicale et Sanitaire (CERMES)Institut National Recherche en Sante Publique (INRSP)Centre National d’Appui à la Lutte Contre la Maladie (CNAM), Centre pour le Développement des Vaccins du Mali (CVD)Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and PreventionInfluenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and PreventionInfluenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and PreventionInfluenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and PreventionAbstract Background Over the last decade, capacity for influenza surveillance and research in West Africa has strengthened. Data from these surveillance systems showed influenza A(H1N1)pdm09 circulated in West Africa later than in other regions of the continent. Methods We contacted 11 West African countries to collect information about their influenza surveillance systems (number of sites, type of surveillance, sampling strategy, populations sampled, case definitions used, number of specimens collected and number of specimens positive for influenza viruses) for the time period January 2010 through December 2012. Results Of the 11 countries contacted, 8 responded: Burkina Faso, Cote d’Ivoire, Mali, Mauritania, Niger, Nigeria, Sierra Leone and Togo. Countries used standard World Health Organization (WHO) case definitions for influenza-like illness (ILI) and severe acute respiratory illness (SARI) or slight variations thereof. There were 70 surveillance sites: 26 SARI and 44 ILI. Seven countries conducted SARI surveillance and collected 3114 specimens of which 209 (7%) were positive for influenza viruses. Among influenza-positive SARI patients, 132 (63%) were influenza A [68 influenza A(H1N1)pdm09, 64 influenza A(H3N2)] and 77 (37%) were influenza B. All eight countries conducted ILI surveillance and collected 20,375 specimens, of which 2278 (11%) were positive for influenza viruses. Among influenza-positive ILI patients, 1431 (63%) were influenza A [820 influenza A(H1N1)pdm09, 611 influenza A(H3N2)] and 847 (37%) were influenza B. A majority of SARI and ILI case-patients who tested positive for influenza (72% SARI and 59% ILI) were children aged 0–4 years, as were a majority of those enrolled in surveillance. The seasonality of influenza and the predominant influenza type or subtype varied by country and year. Conclusions Influenza A(H1N1)pdm09 continued to circulate in West Africa along with influenza A(H3N2) and influenza B during 2010–2012. Although ILI surveillance systems produced a robust number of samples during the study period, more could be done to strengthen surveillance among hospitalized SARI case-patients. Surveillance systems captured young children but lacked data on adults and the elderly. More data on risk groups for severe influenza in West Africa are needed to help shape influenza prevention and clinical management policies and guidelines.http://link.springer.com/article/10.1186/s12879-017-2839-1EpidemiologyInfluenzaWest Africa |
| spellingShingle | Ndahwouh Talla Nzussouo Jazmin Duque Adebayo Abel Adedeji Daouda Coulibaly Samba Sow Zekiba Tarnagda Issaka Maman Adamou Lagare Sonia Makaya Mohamed Brahim Elkory Herve Kadjo Adje Paul Alhassan Shilo Boubou Tamboura Assana Cisse Kossi Badziklou Halima Boubacar Maïnassara Ahmed Ould Bara Adama Mamby Keita Thelma Williams Ann Moen Marc-Alain Widdowson Meredith McMorrow Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012 BMC Infectious Diseases Epidemiology Influenza West Africa |
| title | Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012 |
| title_full | Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012 |
| title_fullStr | Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012 |
| title_full_unstemmed | Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012 |
| title_short | Epidemiology of influenza in West Africa after the 2009 influenza A(H1N1) pandemic, 2010–2012 |
| title_sort | epidemiology of influenza in west africa after the 2009 influenza a h1n1 pandemic 2010 2012 |
| topic | Epidemiology Influenza West Africa |
| url | http://link.springer.com/article/10.1186/s12879-017-2839-1 |
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