Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010
The 2010 Victorian influenza season was characterized by normal seasonal influenza activity and the dominance of the pandemic A(H1N1) 2009 strain. General Practice Sentinel Surveillance rates peaked at 9.4 ILI cases per 1000 consultations in week 36 for metropolitan practices, and at 10.5 ILI cases...
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| Format: | Article |
| Language: | English |
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World Health Organization Regional Office for the Western Pacific
2011-08-01
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| Series: | Western Pacific Surveillance and Response |
| Subjects: | |
| Online Access: | http://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/123/52 |
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| author | James E. Fielding Heath A. Kelly Marlena Kacmarek Renata Kostecki Aeron C. Hurt Kristina A. Grant Lucinda J. Franklin |
| author_facet | James E. Fielding Heath A. Kelly Marlena Kacmarek Renata Kostecki Aeron C. Hurt Kristina A. Grant Lucinda J. Franklin |
| author_sort | James E. Fielding |
| collection | DOAJ |
| description | The 2010 Victorian influenza season was characterized by normal seasonal influenza activity and the dominance of the pandemic A(H1N1) 2009 strain. General Practice Sentinel Surveillance rates peaked at 9.4 ILI cases per 1000 consultations in week 36 for metropolitan practices, and at 10.5 ILI cases per 1000 in the following week for rural practices. Of the 678 ILI cases, 23% were vaccinated, a significantly higher percentage than in previous years. A significantly higher percentage of ILI patients were swabbed in 2010 compared to 2003–2008, but similar to 2009, with a similar percentage being positive for influenza as in previous years. Vaccination rates increased with patient age. Melbourne Medical Deputising Service rates peaked in week 35 at 19.1 ILI cases per 1000 consultations. Of the 1914 cases of influenza notified to the Department of Health, Victoria, 1812 (95%) were influenza A infections - 1001 (55%) pandemic A(H1N1) 2009, 4 (<1%) A(H3N2) and 807 (45%) not subtyped); 88 (5%) were influenza B; and 14 (< 1%) were influenza A and B co-infections. The World Health Organization Collaborating Centre for Reference and Research on Influenza tested 403 isolates of which 261 were positive for influenza, 250 of which were influenza A and 11 were influenza B. Ninety-two per cent of the influenza A viruses were pandemic A(H1N1) 2009, and following antigenic analysis all of these were found to be similar to the current vaccine strain. Three viruses (0.9%) were found to be oseltamivir resistant due to an H275Y mutation in the neuraminidase gene. |
| first_indexed | 2024-12-22T05:19:20Z |
| format | Article |
| id | doaj.art-28b0161d560648d5901a60906f52245e |
| institution | Directory Open Access Journal |
| issn | 2094-7321 2094-7313 |
| language | English |
| last_indexed | 2024-12-22T05:19:20Z |
| publishDate | 2011-08-01 |
| publisher | World Health Organization Regional Office for the Western Pacific |
| record_format | Article |
| series | Western Pacific Surveillance and Response |
| spelling | doaj.art-28b0161d560648d5901a60906f52245e2022-12-21T18:37:45ZengWorld Health Organization Regional Office for the Western PacificWestern Pacific Surveillance and Response2094-73212094-73132011-08-0123101810.5365/wpsar.2011.2.2.009Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010James E. FieldingHeath A. KellyMarlena KacmarekRenata KosteckiAeron C. HurtKristina A. GrantLucinda J. FranklinThe 2010 Victorian influenza season was characterized by normal seasonal influenza activity and the dominance of the pandemic A(H1N1) 2009 strain. General Practice Sentinel Surveillance rates peaked at 9.4 ILI cases per 1000 consultations in week 36 for metropolitan practices, and at 10.5 ILI cases per 1000 in the following week for rural practices. Of the 678 ILI cases, 23% were vaccinated, a significantly higher percentage than in previous years. A significantly higher percentage of ILI patients were swabbed in 2010 compared to 2003–2008, but similar to 2009, with a similar percentage being positive for influenza as in previous years. Vaccination rates increased with patient age. Melbourne Medical Deputising Service rates peaked in week 35 at 19.1 ILI cases per 1000 consultations. Of the 1914 cases of influenza notified to the Department of Health, Victoria, 1812 (95%) were influenza A infections - 1001 (55%) pandemic A(H1N1) 2009, 4 (<1%) A(H3N2) and 807 (45%) not subtyped); 88 (5%) were influenza B; and 14 (< 1%) were influenza A and B co-infections. The World Health Organization Collaborating Centre for Reference and Research on Influenza tested 403 isolates of which 261 were positive for influenza, 250 of which were influenza A and 11 were influenza B. Ninety-two per cent of the influenza A viruses were pandemic A(H1N1) 2009, and following antigenic analysis all of these were found to be similar to the current vaccine strain. Three viruses (0.9%) were found to be oseltamivir resistant due to an H275Y mutation in the neuraminidase gene.http://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/123/52pandemic A(H1N1) 2009 influenzaVictoriaAustralia2010 |
| spellingShingle | James E. Fielding Heath A. Kelly Marlena Kacmarek Renata Kostecki Aeron C. Hurt Kristina A. Grant Lucinda J. Franklin Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010 Western Pacific Surveillance and Response pandemic A(H1N1) 2009 influenza Victoria Australia 2010 |
| title | Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010 |
| title_full | Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010 |
| title_fullStr | Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010 |
| title_full_unstemmed | Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010 |
| title_short | Continued dominance of pandemic A(H1N1) 2009 influenza in Victoria, Australia in 2010 |
| title_sort | continued dominance of pandemic a h1n1 2009 influenza in victoria australia in 2010 |
| topic | pandemic A(H1N1) 2009 influenza Victoria Australia 2010 |
| url | http://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/123/52 |
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