Residual immunity in older people against the influenza A(H1N1)--recent experience in northern Spain
The 2009 pandemic influenza A(H1N1) virus has a higher incidence in children and young adults, a pattern that has also been reported in seasonal influenza caused by the influenza A(H1N1)virus. We analysed age at infection in symptomatic patients with influenza in the Basque Country (northern Spain),...
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| Veröffentlicht in: | Euro surveillance : bulletin européen sur les maladies transmissibles 2009-10, Vol.14 (39) |
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| container_title | Euro surveillance : bulletin européen sur les maladies transmissibles |
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| creator | Pérez-Trallero, E Piñeiro, L Vicente, D Montes, M Cilla, G |
| description | The 2009 pandemic influenza A(H1N1) virus has a higher incidence in children and young adults, a pattern that has also been reported in seasonal influenza caused by the influenza A(H1N1)virus. We analysed age at infection in symptomatic patients with influenza in the Basque Country (northern Spain), reported through the sentinel influenza surveillance system which monitors 2.2-2.5%of the population. Between September 1999 and August 2009,influenza A(H3N2) or seasonal influenza A(H1N1) was detected in 941 patients, and from April to August 2009, pandemic influenza A(H1N1) was detected in 112 patients. The H3/H1 seasonal influenza ratio was between 3.3 and 3.4 in the under 60 year olds,but 9.8 in older individuals, suggesting that people born before 1950 have residual immunity against the influenza A H1N1 subtype (both seasonal and pandemic). |
| doi_str_mv | 10.2807/ese.14.39.19344-en |
| format | Article |
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| ispartof | Euro surveillance : bulletin européen sur les maladies transmissibles, 2009-10, Vol.14 (39) |
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| language | eng |
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| source | MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Adolescent Adult Age Distribution Age Factors Aged Aged, 80 and over Child Child, Preschool Female Humans Immunity, Innate - immunology Incidence Infant Infant, Newborn Influenza A Virus, H1N1 Subtype Influenza, Human - epidemiology Influenza, Human - immunology Male Middle Aged Seasons Spain - epidemiology Young Adult |
| title | Residual immunity in older people against the influenza A(H1N1)--recent experience in northern Spain |
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