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Seroprevalence study of infection with influenza A(H1N1)pdm09 virus in San Felipe Town, Chile

World Journal of Cardiovascular Diseases 2013年第7期3卷 476-482页

作者： Olea Andrea Fasce Rodrigo Aguilera Ximena Oliva Otavio Munoz Sergio Garcia Maritza Pedroni Elena Najera Manuel Guerrero Andrea Bustos Patricia Mora Judith Vega Jeanette Cerda Jaime abarca katia McCarron Meg Widdowson Marc-Alain Castillo Ernesto Alvarado Sergio Quijada Sandra Gallegos Doris Gonzalez Claudia Center of Epidemiology and Health Policies Department Faculty of MedicineUniversidad del DesarrolloConcepcionChile Section of Respiratory and Exanthematous viruses Sub-Department of Clinical VirologyInstitute of Public HealthMinistry of HealthSantiagoChile Center of Epidemiology and Health Policies of the Universidad del Desarrollo ConcepcionChile Panamerican Health Organization Washington DCUSA Public Health Department and Pediatrics Division Faculty of MedicinePontifical Catholic University of ChileSantiagoChile Centers for Diseases Control and Prevention AtlantaUSA Center for Micro Data Economics DepartmentUniversity of ChileSantiagoChile Epidemiology and Health Policies Department Universidad del DesarrolloConcepcionChile

Objective: To know the natural history of the first wave of pandemic influenza A(H1N1)pdm09 in the Southern hemisphere, through the detection of antibodies against influenza A(H1N1)pdm09 in a selected community, to estimate the population attack rate and its variations, the consultation rates, hospitallization and mortality rates. Methodology: A representative random sample of the population of a commune in Chile (San Felipe) was interviewed and taken blood samples between January and March 2010. A study against the antibodies of the influenza A(H1N1) pdm09 virus was conducted, by the technique of the Hemaglutination Inhibition (HAI) according to standardized methodology. Subjects with antibody titers ≥1:40 were considered positive. Results: 13.5% of the population of San Felipe had antibodies against influenza A(H1N1)pdm09;this percentage reached 30% of the population between 0 and 18 years and 6.1% among those over 19 years. The age variable was the only factor that evidenced significant differences in the prevalence of antibodies. There were no significant differences related to gender, vaccination history against seasonal inluenza, or comorbidity. 51% of people with positive serology showed IN-FLUENZA-LIKE SYMPTOMS. Conclusions: A relevant percentage of subclinical disease was detected in the first pandemic wave in Chile and the proportion of people with SARI and deaths was small. Data from epidemiological surveillance were useful to estimate the trend of TSI but not its magnitude.

关键词： Influenza A(H1N1)pdm09 Influenza Seroprevalence

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