Isolation/detection of influenza virus in Japan, week 18/2013-week 45/2013 (as of November 19, 2013)

In Japan, Infectious Disease Surveillance Center (IDSC) of National Institute of Infectious Diseases (NIID) is notified the results of isolation/detection of infectious agents from prefectural and municipal public health institutes (PHIs). Their information are based on the laboratory identification done by PHIs for the specimens collected at sentinel clinics/ hospitals under the National Epidemiological Surveillance of Infectious Diseases (NESID), occasionally at non-sentinel sites and at health centers (Reference figure).

Figure 1. Weekly reports of influenza virus isolation/detection, week 18/2013-week 45/2013

Figure 2. Isolation/detection of influenza virus by prefecture, week 36/2013-week 45/2013

After week 18/2013, a small number of influenza virus isolations/detections was reported. 　In the 2013/14 season (from week 36/September of 2013), isolations/detections of AH1pdm09 and AH3 were reported since week 36/2013. 　Those of B/Yamagata lineage and B/Victoria lineage were reported in week 40 and week 41/2013, respectively (Fig. 1).

From the begining of 2013/14 season, AH1pdm09 from 16 cases in 5 of 47 prefectures, AH3 from 37 cases in 7 prefectures, B/Victoria lineage from 7 cases in 4 prefectures, B/Yamagata lineage from 7 cases in 3 prefecture were reported (Fig. 2).
Of these, influenza viruses isolated/detected from overseas traveler included subtype AH1pdm09 (5 cases: 2 Indonesia, 1 Philippines, 1 China, 1 Thailand/Nepal), AH3 (4 cases: 3 Philippines, 1 Thailand/Cambodia) and B/Victoria　lineage (1 Viet Nam).

[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 3-8) of 2012 to week 11 (March 11-17) of 2013 (as of March 18, 2013)

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

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