An Outbreak of Norovirus Gastroenteritis at a Swimming Club

  • No one exposed gets sick

    Swimmers exposed this day never report illness.
  • Period: to

    High pool usage

    Pool used by many groups and individuals.
  • Period: to

    Pool cloudy

    Swimmers upon interview report pool was cloudy.
  • Attack rates decline sharply

    Attack rates on exposed individuals decline sharply this day
  • Chlorine low, so "shock" done

    In the morning, chrlorine levels were found to be low, so in the afternoon, a chlorine "shock" was done.
  • Comprehensive review

    Comprehensive environmental health systems review done.
  • VDH Notified

    Vermont Department of Health notified of outbreak.