Epidemiological Characteristics of Sapovirus and Human Astrovirus Detected among Children in Nara Prefecture, Japan, during the 2009/2010–2014/2015 Seasons

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  • Yoneda Masaki
    Virology and Epidemiology Division, Nara Prefecture Institute of Health
  • Nakano Mamoru
    Virology and Epidemiology Division, Nara Prefecture Institute of Health
  • Sugimoto Daichi
    Virology and Epidemiology Division, Nara Prefecture Institute of Health
  • Inada Machi
    Virology and Epidemiology Division, Nara Prefecture Institute of Health
  • Fujitani Misako
    Virology and Epidemiology Division, Nara Prefecture Institute of Health
  • Kitahori Yoshiteru
    Virology and Epidemiology Division, Nara Prefecture Institute of Health

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  • Epidemiological Characteristics of Sapovirus and Human Astrovirus Detected among Children in Nara Prefecture, Japan, during the 2009/2010–2014/2015 Seasons

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The current study elucidated the epidemiological characteristics of sapovirus (SaV) and human astrovirus (HAstV) associated with gastroenteritis among children in regional populations of Nara Prefecture, Japan, during the 2009/2010–2014/2015 seasons. The SaV detection rate was 7.5% (71/948) according to reverse transcription-polymerase chain reaction. A high SaV detection rate of 13.5% was observed among children 4 years of age. The highest SaV detection rate was observed in June (19.2%), followed by July (11.1%). The detected SaV included 7 genotypes: GI.1, GI.2, GII.3, GII.1, GI.3, GII.2, and GV, in order of decreasing prevalence. In comparison, the HAstV detection rate was 4.2% (40/948). The HAstV detection rate among children 4 years of age was 12.2%. The HAstV detection rate was highest in July (13.9%), followed by May (10.5%) and August (6.7%). The detected HAstVs included genotypes 1, 4, 6, and 8. The most prevalent genotype was 1, followed by 4 and 8. This report provides an epidemiological overview of SaV and HAstV infection in Nara Prefecture, Japan.

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