Isolation/detection of influenza virus in Japan, week 36/2012-week 4/2013 (as of January 31, 2013)
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| Figure 1. Weekly reports of influenza virus isolation/detection, week 36/2012-week 5/2013 |
| Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2012-week 5/2013 |
| Figure 3. Weekly isolation/detection of influenza virus by prefecture, week 52/2012-week 4/2013 |
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 again from week 2/2013 (Fig. 1). In the 2012/13 season, from week 36 (September 3-9, 2012) to week 5 (January 28-February 3, 2013), isolations/detections of AH1pdm09 from 39 cases in 16 prefectures, AH3 from 1,276 cases in 45 prefectures, B/Victoria lineage from 37 cases in 11 prefectures, B/Yamagata lineage from 37 cases in 11 prefectures and B/lineage not determined from 20 cases in 11 prefectures were reported (Fig. 2). |
During five weeks from week 52 of 2012 to week 4 of 2013, isolations/detections of AH1pdm09 from 19 cases in 9 prefectures, AH3 from 738 cases in 36 prefectures, B/Victoria lineage from 15 cases in 8 prefectures, B/Yamagata lineage from 25 cases in 10 prefectures and B/lineage not determined from 10 cases in 6 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 |
