Comparative epidemiology of influenza A and B viral infection in a subtropical region: a 7-year surveillance in Okinawa, Japan

Table 1 Result of rapid antigen tests performed in four general hospitals in Okinawa

Year	Number of tests performed	Influenza A positive	Influenza B positive	Influenza A/B positive
2007	19,229	5143 (26.7 %)	623 (4.4 %)	6 (0.04 %)
2008	13,089	1878 (14.3 %)	797 (7.1 %)	4 (0.04 %)
2009	41,962	12,741 (30.4 %)	1153 (3.9 %)	18 (0.06 %)
2010	13,825	2508 (18.1 %)	107 (0.9 %)	2 (0.02 %)
2011	24,468	4128 (16.9 %)	1940 (9.5 %)	7 (0.04 %)
2012	27,148	5284 (19.5 %)	1353 (6.2 %)	4 (0.02 %)
2013	18,494	2475 (13.4 %)	728 (4.5 %)	0 (0.00 %)
2014 (Jan. to Mar.)	10,659	3152 (29.6 %)	576 (7.7 %)	1 (0.01 %)
Total	168,874	37,309 (22.1 %)	7277 (4.3 %)	42 (0.03 %)

The annual number of rapid antigen tests (RAT) performed and reported positive results for influenza A, B, and A/B co-infected patients in four representative hospitals in Okinawa, Japan

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