Isolation/detection of influenza virus in Japan, week 36/2012-week 3/2013 (as of January 24, 2013)
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| Figure 1. Weekly reports of influenza virus isolation/detection, week 36/2012-week 4/2013 |
| Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2012-week 4/2013 |
| Figure 3. Weekly isolation/detection of influenza virus by prefecture, week 51/2012-week 3/2013 |
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 4 (January 21-27, 2013), isolations/detections of AH1pdm09 from 31 cases in 15 prefectures, AH3 from 789 cases in 44 prefectures, B/Victoria lineage from 27 cases in 7 prefectures, B/Yamagata lineage from 23 cases in 9 prefectures and B/lineage not determined from 11 cases in 7 prefectures were reported (Fig. 2). |
 Fig. 3).[Reference figure] Weekly cases of influenza and isolation/detection of influenza viruses from week 36 of 2008 to week 41 of 2011 |
| Isolation/detection of influenza virus in Japan, from week 36 (September 5-11) of 2011 to week 25 (June 18-24) of 2011 (as of July 19, 2012) |
| Isolation/detection of influenza virus in Japan, from week 36 (September 6-12) of 2010 to week 19 (May 9-15) of 2011 (as of September 6, 2011) |
| Isolation/detection of influenza virus in Japan, from week 19 (May 4-10) of 2009 to week 19 (May 10-16) of 2010 (as of May 13, 2010) |
| Infectious Agents Surveillance Report, Infectious Disease Surveillance Center, National Institute of Infectious Diseases |
