Isolation/detection of rubella virus in Japan, 2012-2016 (as of October 2, 2016)
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.
Figure 1．Weekly reports of rubella virus isolation/detection, week 1/2012-week 38/2016 Figure 2．Isolation/detection of rubella virus by prefecture, 2012 - 2016 Figure 3．Age distribution and gender of rubella virus isolation/detection, 2012 - 2016 Figure 4．Age distribution of rubella virus isolation/detection, 2012 - 2016
In 2013, the reported number of rubella virus isolation/detection was largely increased (Fig.1).
In 2013 (week 1 to 52), the information of rubella virus isolated/detected from 984 cases in 32 of 47 prefectures was reported. Among 457 strains genotyped, the genotype 2B from 412 cases was dominant (90%). The genotype 1E from 42 cases follows (9.2%). The genotype 1a (vaccine type) was reported from 3 MR vaccinees (Fig.2). In 2012, PHIs in 24 prefectures reported the information of 233 rubella virus isolation/detection. Out of 170 strains genotyped, 134 belong to genotype 2B (79%), the genotype 1E from 35 cases (21%), and genotype 1a (0.6%) from a MR vaccinee (Fig.2).
Rubella viruses were predominantly detected from 908 males especially in their 20s to 40s. Among 302 females, the viruses were most frequently detected (Fig.3).>
Infectious Agents Surveillance Report, Infectious Disease Surveillance Center, National Institute of Infectious Diseases |
