Reis Priscilleyne Ouverney, Iser Betine Pinto Moehlecke, Souza Líbia Roberta de Oliveira, Yokota Renata Tiene de Carvalho, de Almeida Walquiria Aparecida Ferreira, Bernal Regina Tomie Ivata, Malta Deborah Carvalho, de Oliveira Wanderson Kleber, Penna Gerson Oliveira
Health Surveillance Secretary (SVS), Health Ministry, General Coordination of Communicable Diseases (CGDT), Department of Epidemiologic Surveillance (DEVEP), Brasília (DF), Brazil.
Rev Bras Epidemiol. 2011 Sep;14 Suppl 1:115-24. doi: 10.1590/s1415-790x2011000500012.
In order to estimate the prevalence of influenza like illness (ILI) in adults from all state capitals and geographic regions in Brazil, a periodical monitoring of ILI cases by the national telephone survey (VIGITEL) was carried out in 2010.
A cross-sectional study with 47,876 telephone interviews in the state capitals and Federal District, a probabilistic sample of adult population (>18 years-old) with landline telephone. Questions concerning the results of ILI cases and pandemic influenza (H1N1) 2009, from January 10 to November 30, were analyzed. The proportion of cases stratified by sociodemographic characteristics and Brazilian geographic region was weighted with data from the National Survey with Household Sampling (PNAD) 2008.
The prevalence of ILI cases in the last 30 days before interview was 31.2% (95%CI 30.2-32.2%) for all state capitals and the Federal District. This prevalence was higher among women, young adults (18 to 29 years-old) and individuals with 9 to 11 years of schooling. According to the geographic region analysis, Northern Brazil presented the highest prevalence of ILI cases. A tendency to increase with further decrease was observed among the geographic regions, except the Northeast. Need for health care assistance was reported by 26.8% (95%CI 25.1-28.5) from ILI cases. Among ILI cases that sought health care assistance, 2.6% (95%CI 1.8-3.4) reported pandemic influenza (H1N1) 2009 medical suspicion.
The results of this survey supported influenza surveillance as it provided timeliness and useful surveillance information, which were not captured by the traditional surveillance system, as the occurrence of ILI and need of health care assistance.
为了评估巴西所有州首府和地理区域成年人中流感样疾病（ILI）的患病率，2010年通过全国电话调查（VIGITEL）对ILI病例进行了定期监测。
在州首府和联邦区进行了一项横断面研究，对47876名有固定电话的成年人口（>18岁）进行了电话访谈，这是一个概率样本。分析了2009年1月10日至11月30日期间有关ILI病例和甲型H1N1流感大流行的问题。按社会人口学特征和巴西地理区域分层的病例比例用2008年全国住户抽样调查（PNAD）的数据进行加权。
在接受访谈前的最后30天内，所有州首府和联邦区ILI病例的患病率为31.2%（95%置信区间30.2 - 32.2%）。这种患病率在女性、年轻人（18至29岁）和受过9至11年教育的个体中更高。根据地理区域分析，巴西北部ILI病例的患病率最高。除东北部外，各地理区域呈现出患病率随进一步下降而上升的趋势。26.8%（95%置信区间25.1 - 28.5）的ILI病例报告需要医疗保健援助。在寻求医疗保健援助的ILI病例中，2.6%（95%置信区间1.8 - 3.4）报告怀疑感染了2009年甲型H1N1流感大流行病毒。
本次调查结果支持流感监测，因为它提供了及时性和有用的监测信息，这些信息是传统监测系统所未获取的，如ILI的发生情况和医疗保健援助需求。
