Public urged to be alert to signs and symptoms of norovirus as cases up over 50% in a week The JournalNorovirus cases up over 50% in a week, says HSE RTE.ieSurge in winter vomiting bug as cases double The Irish Independent‘Actions make a difference’: HSE issues warning as norovirus cases surge Irish ExaminerHSE warning over symptoms of ‘hard to avoid’ bug sweeping Ireland Cork Beo