Epidemiological aspects of 2009 H1N1 influenza: the accumulating experience from the Northern Hemisphere

摘要: Preliminary data regarding the experience of countries Northern Hemisphere with pandemic 2009 A(H1N1) influenza have already appeared in literature. We aimed to evaluate available published literature describing epidemiological features influenza. searched PubMed; 35 studies (14 referred European countries, eight USA, five Mexico, four Canada, two Japan, one Colombia, and reviewed relevant reported worldwide) were included. Considerably high hospitalization, intensive care unit (ICU) admission, fatality rates (up 93.8, 36.4, 38.5%, respectively) among evaluated cases across data. Young middle-aged adults constituted majority cases, different disease severity (as indicated by level outcome). Yet, substantial percentages elderly individuals more severely afflicted cases. Otherwise healthy patients severity. Pregnant women, obese, morbidly obese also involved included studies. The evaluation currently evidence contributes clarification influenza, which is useful terms individual public health perspectives.