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Influenza in Africa: uncovering the epidemiology of a long-overlooked disease.

Influenza is a well-documented cause of morbidity and mortality in high- and middle-income countries. In the past few decades and particularly during the recent influenza pandemic, numerous studies and surveillance reports in the United States, Europe, Australia, and parts of Asia have improved our understanding of the epidemiology and burden of influenza in those regions. In Africa, however, the picture is quite different. Until the latter half of the last decade minimal effort had been made to understand the epidemiology, burden, and seasonality of influenza in Africa, a continent where some of the poorest populations in the world reside; where human immunodeficiency virus (HIV) infection and AIDS, tuberculosis, and malaria have long ravaged residents; and where resources for health are scarce and often directed at securing basic healthcare and prevention measures. As a result, the impact of the disease in this region has been considered negligible [1].