Details
  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 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). 
From week 51 (December 17-23) of 2012 to week 3 (January 14-20) of 2013  (as of January 24, 2013)

  During five weeks from week 51 of 2012 to week 3 of 2013, isolations/detections of AH1pdm09 from 14 cases in 7 prefectures, AH3 from 449 cases in 34 prefectures, B/Victoria lineage from 12 cases in 5 prefectures, B/Yamagata lineage from 11 cases in 7 prefectures and B/lineage not determined from 2 cases in 2 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
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 2/2013 (as of January 17, 2013)
  2. Isolation/detection of influenza virus in Japan, week 36/2012-week 52/2012 (as of January 10, 2013)
  3. Isolation/detection of influenza virus in Japan, week 36/2012-week 51/2012 (as of January 3, 2013)
  4. Isolation/detection of influenza virus in Japan, week 36/2012-week 50/2012 (as of December 20, 2012)
  5. Isolation/detection of influenza virus in Japan, week 36/2012-week 49/2012 (as of December 13, 2012)
  6. Isolation/detection of influenza virus in Japan, week 36/2012-week 48/2012 (as of December 6, 2012)
  7. Isolation/detection of influenza virus in Japan, week 36/2012-week 47/2012 (as of November 29, 2012)
  8. Isolation/detection of influenza virus in Japan, week 36/2012-week 46/2012 (as of November 21, 2012)
  9. Isolation/detection of influenza virus in Japan, week 36/2012-week 45/2012 (as of November 15, 2012)
  10. Isolation/detection of influenza virus in Japan, week 36/2012-week 43/2012 (as of November 1, 2012)

Copyright 1998 National Institute of Infectious Diseases, Japan