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Figure 1. Weekly reports of influenza virus isolation/detection, week 36/2012-week 11/2013 |
Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2012-week 11/2013 |
Figure 3. Weekly isolation/detection of influenza virus by prefecture, week 6-week 10/2013 |
From the beginning of 2012/13 season (from week 36/September of 2012 to week 35/August of 2013), isolations/detections of influenza virus AH3 was dominantly reported and the report increased from week 47 (November 19-25). After the New Year holidays, the report increased with a peak in weeks 2-4 of 2013 and decreased thereafter (Fig. 1). In the 2012/13 season, from week 36 (September 3-9, 2012) to week 11 (March 11-17, 2013), isolations/detections of AH1pdm09 from 88 cases in 30 prefectures, AH3 from 3,551 cases in 47 prefectures, B/Victoria lineage from 148 cases in 23 prefectures, B/Yamagata lineage from 242 cases in 31 prefectures and B/lineage not determined from 106 cases in 25 prefectures were reported (Fig. 2). |
From week 6 (February 4-10) to week 10 (March 4-10) of 2013 (as of March 18, 2013) |
During five weeks from week 6 to week 10 of 2013, isolations/detections of AH1pdm09 from 25 cases in 12 prefectures, AH3 from 639 cases in 33 prefectures, B/Victoria lineage from 58 cases in 16 prefectures, B/Yamagata lineage from 111 cases in 23 prefectures and B/lineage not determined from 47 cases in 16 prefectures were reported (Fig. 3). [Reference figure] Weekly cases of influenza and isolation/detection of influenza viruses from week 36 of 2008 to week 41 of 2011 |
Infectious Agents Surveillance Report, Infectious Disease Surveillance Center, National Institute of Infectious Diseases |