Publications by authors named "Masahiro Umezawa"
Article Synopsis
- Human norovirus (HuNoV) is a leading cause of viral gastroenteritis, with GII.4 being the most common strain, though other genotypes like GII.2, GII.6, and GII.17 are also noteworthy.
- An epidemiological study in Ibaraki Prefecture, Japan, from September 2012 to August 2018 revealed that each GII genotype had distinct outbreak patterns and patient demographics, with GII.4 showing a resurgence after a decline.
- The research highlighted that different genotypes were linked to various outbreak locations, like childcare facilities and nursing homes, indicating a complex interplay between these viruses and their environments.
Background: Hepatitis E virus (HEV) is prevalent in pigs and may serve as a reservoir for human infection. However, data on HEV infections in pigs in Ibaraki Prefecture, Japan, are limited. Here, we clarified the process and course of HEV in naturally infected pigs.
View Article and Find Full Text PDFA nationwide rubella epidemic occurred from 2012 to 2013 in Japan, resulting in around 17,000 rubella cases and the birth of 45 infants with congenital rubella syndrome. The aim of this study was to genetically characterize the rubella viruses (RVs) circulating around the time of the epidemic in Japan. In total, 221 RV strains detected from 14 prefectures in Japan between 2010 and 2014 were sequenced in the 739 nucleotide-window region within the gene.
View Article and Find Full Text PDFThe invasion of the yellow fever mosquito Aedes aegypti at Narita International Airport, Japan was detected for the first time. During the course of routine vector surveillance at Narita International Airport, 27 Ae. aegypti adults emerged from larvae and pupae collected from a single larvitrap placed near No.
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