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  In Japan, prefectural and municipal public health institutes (PHIs) report isolation/detection of infectious agents from specimens collected by sentinel clinics and hospitals under the National Epidemiological Surveillance of Infectious Diseases, other medical institutions and health centers (Reference figure).
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
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
 
Go to Flash report of influenza virus in Japan
  1. Isolation/detection of influenza virus in Japan, week 36/2012-week 48/2012 (as of December 6, 2012)
  2. Isolation/detection of influenza virus in Japan, week 36/2012-week 47/2012 (as of November 29, 2012)
  3. Isolation/detection of influenza virus in Japan, week 36/2012-week 46/2012 (as of November 21, 2012)
  4. Isolation/detection of influenza virus in Japan, week 36/2012-week 45/2012 (as of November 15, 2012)
  5. Isolation/detection of influenza virus in Japan, week 36/2012-week 43/2012 (as of November 1, 2012)
  6. Isolation/detection of influenza virus in Japan, week 36/2012-week 41/2012 (as of October 18, 2012)
  7. Isolation/detection of influenza virus in Japan, week 19/2012-week 37/2012 (as of September 27, 2012)
  8. Isolation/detection of influenza virus in Japan, week 36/2011-week 25/2012 (as of July 19, 2012)
  9. Flash report of influenza virus in Japan

Copyright 1998 National Institute of Infectious Diseases, Japan