In Japan, prefectural and municipal public health institutes (PHIs) report 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.
From gastroenteritis cases, norovirus and other viruses (sapovirus, rotavirus, astrovirus etc.) are detected.
*Data for current and previous weeks will be updated by additional reports.
Figure 1. Weekly reports of norovirus, sapovirus and rotavirus detection, 2011/12 season
Figure 2. Detection of norovirus, sapovirus and rotavirus by prefecture, 2011/12 season
In 2011/12 season, based on the Individual Case Report from week 36 of 2011 to week 35 of 2012 (week of specimen collection), norovirus GII detections from 2,369 cases in 45 prefectures (including GII/4 from 500 cases, GII/2 from 88 cases, GII/13 from 82 cases, GII/12 from 42cases, GII/3 from 29 cases, GII/6 from 26 cases, GII/5 from 9 cases, GII/7 from 4 cases, GII/14 from 3 cases, GII/17 from 2 cases, and GII/1 from one case) were reported with two peaks at week 50 of 2011 and week 3 of 2012. Group A rotavirus detections from 769 cases in 36 prefectures (including genotype G1 from 194 cases, G3 from 65 cases, G9 from 43 cases, G2 from 22 cases and G12 from one case) were reported with a peak at weeks 15-17 of 2012.
In addition, detections of norovirus GI from 256 cases in 29 prefectures (including GI/4 from 51 cases, GI/14 from 19 cases, GI/8 from 12 cases, GI/2 from 9 cases, GI/6 from 9 cases, GI/1 from 7 cases, GI/3 from 5 cases, GI/7 from 4 cases, GI/12 from 2 cases and GI/13 from one case), norovirus genogroup unknown from 96 cases in 3 prefectures, sapovirus from 319 cases in 37 prefectures (including GI from 95 cases, GII from 45 cases, GIV from 2 cases and GV from one case), group C rotavirus from 17 cases in 3 prefectures, and astrovirus from 104 case in 22 prefectures (including type 1 from 50 cases and type 4 from 7 cases, type 3 from 2 cases and type 5 from one case) were reported.
Infectious Agents Surveillance Report, Infectious Disease Surveillance Center,
National Institute of Infectious Diseases