国立感染症研究所

Isolation/detection of influenza virus in Japan, week 36/2011-week 25/2012 (as of July 19, 2012)

  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 36/2011-week 25/2012
Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2011-week 25/2012
Figure 3. Weekly isolation/detection of influenza virus by prefecture, weeks 21-25/2012
  In the 2011/12 season, isolation/detection of AH3 continues from week 36 of 2011 and largely increased from week 2 of 2012 and decreased after the peak of week 3. Isolations/detections of B/Yamagata lineage and B/Victoria lineage were first reported in week 39 and week 40 of 2011, respectively, and slightly increased from week 2 of 2012 and decreased after week 18. In addtion, isolations/detections of AH1pdm09 were sporadically reported in weeks 41-42 and 51-52 of 2011 and weeks 1, 3, 6, 7, 8, 11, 14, 15, 17 and 25 of 2012 (Fig. 1).

 

  From week 36 (September 5-11) of 2011 to week 25 (June 18-24) of 2012, isolations/detections of AH1pdm09 from 14 cases in 10 of 47 prefectures, AH3 from 5,005 cases in all prefectures, B/Victoria lineage from 1,086 cases in 40 prefectures, B/Yamagata lineage from 541 cases in 39 prefectures and B/lineage not determined from 354 cases in 36 prefectures were reported (Fig. 2). 

From week 21 (May 21-27) to week 25 (June 18-24) of 2012  (as of July 19, 2012)

  During five weeks from week 21 to week 25 of 2012, isolations/detections of AH1pdm09 from a case in Ibaraki Prefecture, AH3 from 7 cases in 6 prefectures, B/Victoria lineage from 12 cases in 9 prefectures, B/Yamagata lineage from 4 cases in 4 prefectures and B/lineage not determined from 3 cases in 3 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 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
 

Copyright 1998 National Institute of Infectious Diseases, Japan

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