The fatal illnesses occurred on the Ruby Princess and Emerald Princess . Princess Cruises is working with investigators to determine the cause . The Crown Princess was cleaned Saturday and has returned to sea , she said . Norovirus can cause nausea , vomiting and stomach pains .
The fatal illnesses occurred on the Ruby Princess and Emerald Princess . Princess Cruises is working with investigators to determine the cause . Norovirus can cause nausea , vomiting and stomach pains .