As of December 2011, most cases of human infection by H5N1 Influenza virus were reported in Cambodia, China, Egypt, Indonesia, Thailand and Vietnam. In the following graph [1], note that successive peaks were reported by Vietnam and Indonesia, followed by increasing activity in Egypt during recent years.

The second graph [1] illustrates the fact that a disproportionately high case fatality rate has been reported among cases occurring in Indonesia.

References:
1. Graph tutorial at: http://www.GIDEONonline.com/wp/wp-content/uploads/Gideon-Graphs.pps

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