Additional file 1: of Invasive pneumococcal disease among adults in Japan, April 2013 to March 2015: disease characteristics and serotype distribution

Distribution of the 10 prefectures participating in the enhanced surveillance. They are marked with numbers on a Japanese map: 1: Hokkaido; 2: Miyagi; 3: Yamagata; 4: Niigata; 5: Mie; 6: Nara; 7: Kochi; 8: Fukuoka; 9: Kagoshima; and 10: Okinawa prefecture. (PPTX 156 kb)