Isolation/detection of influenza virus in Japan, week 36/2012-week 52/2012 (as of January 10, 2013)
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| Figure 1. Weekly reports of influenza virus isolation/detection, week 36/2012-week 2/2013 |
| Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2012-week 2/2013 |
| Figure 3. Weekly isolation/detection of influenza virus by prefecture, weeks 48-52/2012 |
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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) (Fig. 1). In the 2012/13 season, from week 36 (September 3-9, 2012) to week 2 (January 7-13, 2013), isolations/detections of AH1pdm09 from 25 cases in 12 prefectures, AH3 from 411 cases in 38 prefectures, B/Victoria lineage from 21 cases in 4 prefectures, B/Yamagata lineage from 12 cases in 4 prefectures and B/lineage not determined from 8 cases in 6 prefectures were reported (Fig. 2). |
 From week 48 (November 26-December 2) to week 52 (December 24-30) of 2012 (as of January 10, 2013) |
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During five weeks from week 48 to week 52 of 2012, isolations/detections of AH1pdm09 from 7 cases in 2 prefectures, AH3 from 251 cases in 32 prefectures, B/Victoria lineage from 14 cases in 4 prefectures, B/Yamagata lineage from 11 cases in 4 prefectures and B/lineage not determined from 6 cases in 5 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 |
