After week 18/2013, a small number of influenza virus isolations/detections was reported. In the 2013/14 season (from week 36/September of 2013 to week 35/August of 2014), isolations/detections of AH1pdm09 and AH3 were reported since week 36/2013 and isolation of B/Victoria lineage was reported in week 41/2013 (Fig. 1).
From the begining of 2013/14 season, AH1pdm09 from 14 cases in 5 of 47 prefectures, AH3 from 23 cases in 4 prefectures, B/Victoria lineage from one case in Osaka Prefecture were reported (Fig. 2). Of these, influenza viruses isolated/detected from overseas traveler included subtype AH1pdm09 (5 cases: 2 Indonesia, 1 Philippines, 1 China, 1 Thailand/Nepal) and AH3 (4 cases: 3 Philippines, 1 Thailand/Cambodia).
[Reference figure] Weekly cases of influenza and isolation/detection of influenza viruses from week 36 of 2008 to week 41 of 2011
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