A severe 2017 influenza season dominated by influenza A(H3N2), Victoria, Australia
Autor: | Julian Druce, Kristina A Grant, Sheena G. Sullivan, James E Fielding, Kylie S Carville, J Strachan |
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Rok vydání: | 2018 |
Předmět: |
Adult
Male Vaccination Coverage Surveillance data Adolescent Victoria influenza-like illness lcsh:Medicine Influenza season Reference laboratory medicine.disease_cause Disease Outbreaks Young Adult Vaccine strain vaccine Influenza Human Influenza A virus medicine Humans Surveillance Report magnitude Child Non theme issue Aged Clinical Laboratory Techniques business.industry Influenza A Virus H3N2 Subtype lcsh:Public aspects of medicine lcsh:R Infant Newborn victorian sentinel practice influenza network (vicspin) Infant virus diseases lcsh:RA1-1270 Influenza a General Medicine Middle Aged Government department Influenza B virus Child Preschool Population Surveillance General practice surveillance influenza strain Female world health organization collaborating centre for reference and research on influenza (whoccrri) influenza business Demography |
Zdroj: | Western Pacific Surveillance and Response, Vol 9, Iss 5, Pp 18-26 (2019) Western Pacific Surveillance and Response Journal : WPSAR |
ISSN: | 2094-7313 2094-7321 |
Popis: | Surveillance for influenza-like illness (ILI) and laboratory-confirmed influenza in Victoria, Australia is undertaken jointly by the Victorian Infectious Diseases Reference Laboratory and the Victorian Government Department of Health and Human Services from May to October each year. Surveillance data comprise notifiable laboratory-confirmed influenza and ILI reporting from from two sources – a general practice sentinel surveillance programme and a locum service. The magnitude of the 2017 influenza season was high in Victoria with widespread circulation of influenza type A(H3N2), which peaked in September. A record number of laboratory-confirmed influenza cases were notified, and the proportion of ILI cases to total consultations from both the general practice and locum service were higher than previous years. Notified cases of influenza A were older than influenza B cases with 25% compared to 17% aged more than 65 years, respectively. The proportion of swabs that were positive for influenza peaked at 58%. Antigenic characterization suggested a good match between the circulating and vaccine strains of influenza A(H3N2). Most of the increases observed in notified cases of laboratory-confirmed influenza in recent years in Victoria have been attributed to increases in testing. However, that cases of ILI also increased in Victoria in 2017 is suggestive that 2017 was a relatively severe season. The dominance of influenza type A(H3N2), the extended duration of elevated activity, and a potential phylogenetic mismatch of vaccine to circulating strains are likely to have contributed to the relative severity of the 2017 season. Victoria is Australia’s second most populous state and is the mainland’s southernmost state. It has a temperate climate with an influenza season usually occurring in the cooler months between May and October. The Victorian Infectious Diseases Reference Laboratory (VIDRL), in partnership with the Victorian Government Department of Health and Human Services (DHHS), coordinates influenza-like illness (ILI) and laboratory-confirmed influenza surveillance in Victoria. There are three data sources included in the influenza surveillance system. |
Databáze: | OpenAIRE |
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