Dehydration (may occur in young children or elderly)


      The illnesses usually last for 1-2 days without chronic sequel


      Special notes:


      Norovirus is highly infectious.


      Persons become infectious from symptom onset and may last for 2 weeks after recovery.


      Control on personal hygiene of infected persons, and thorough environmental cleansing (e.g.household bleach (5.25%) diluted in 1:49 water) are key to prevent secondary spread.


      University hostels and areas with high human density are at risk for norovirus outbreak.


      Students and staff should be alert for symptoms of vomiting and diarrhea, and prompt for advice from University Health Clinic.


      Useful links:


      English version


      Centre for Health Protection of Department of Health - Norovirus Infection




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