Question: what countries were most affected by swine flu?
Answer: Pandemic (H1N1) 2009 virus The highest rate of detection of pandemic (H1N1) 2009 influenza virus was reported by Greece (99%; 147 out of 149 detections), Chile (98%; 160 out of 163), the Republic of Korea (98%; 258 out of 263), Italy (97%; 584 out of 600), and Australia (89%; 745 out of 834).