Isolation/detection of influenza virus in Japan, week 36/2012-week 9/2013 (as of February 28, 2013)
|
| Figure 1. Weekly reports of influenza virus isolation/detection, week 36/2012-week 9/2013 |
| Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2012-week 9/2013 |
| Figure 3. Weekly isolation/detection of influenza virus by prefecture, week 4-week 8/2013 |
|
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 9 (February 25-March 3, 2013), isolations/detections of AH1pdm09 from 62 cases in 27 prefectures, AH3 from 2,842 cases in 47 prefectures, B/Victoria lineage from 97 cases in 18 prefectures, B/Yamagata lineage from 147 cases in 28 prefectures and B/lineage not determined from 57 cases in 21 prefectures were reported (Fig. 2). |
|
During five weeks from week 4 to week 8 of 2013, isolations/detections of AH1pdm09 from 12 cases in 10 prefectures, AH3 from 1,051 cases in 42 prefectures, B/Victoria lineage from 48 cases in 15 prefectures, B/Yamagata lineage from 91 cases in 23 prefectures and B/lineage not determined from 35 cases in 15 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 |
