Isolation/detection of influenza virus in Japan, week 36/2012-week 49/2012 (as of December 13, 2012)
|
| Figure 1. Weekly reports of influenza virus isolation/detection, week 19/2012-week 50/2012 |
| Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2012-week 50/2012 |
| Figure 3. Weekly isolation/detection of influenza virus by prefecture, weeks 45-49/2012 |
|
After week 19/2012, a small number of influenza virus isolations/detections was reported (Fig. 1). In Okinawa and Osaka Prefectures, local outbreak of influenza AH3 occurred in summer and detection of AH3 was dominant from week 26/2012 till now, the early 2012/13 season (from week 36/September of 2012 to week 35/August of 2013). In the 2012/13 season, from week 36 (September 3-9) to week 50 (December 10-16) of 2012, isolations/detections of AH1pdm09 from 15 cases in 9 prefectures, AH3 from 154 cases in 30 prefectures, B/Victoria lineage from 10 cases in 2 prefectures, B/Yamagata lineage from one case in Kanagawa Prefecture and B/lineage not determined from 4 cases in 3 prefectures were reported (Fig. 2). |
 From week 45 (November 5-11) to week 49 (December 3-9) of 2012 (as of December 13, 2012) |
|
During five weeks from week 45 to week 49 of 2012, isolations/detections of AH1pdm09 from 4 cases in 3 prefectures, AH3 from 49 cases in 18 prefectures, B/Victoria lineage from 10 cases in 2 prefectures and B/lineage not determined from 2 cases in Nagano Prefecture 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 |
