"We have put signs up regarding gastroenteritis at the entrance to the ward," she said.
"Visitors to the hospital are advised not to visit if they have had an episode of vomiting/diarrhoea recently, and if they do visit the hospital, to wash their hands before and after they have visited patients or had appointments.
She said patients who have symptoms are being cared for separately using special precautions like using gowns and masks.
"There is enhanced cleaning in the ward.
"All staff are vigilant with hand washing and are helping by cleaning commonly touched surfaces with bleach-based solutions."
Good hand hygiene at home was also important in reducing the spread of gastroenteritis in the community.
-Wairarapa DHB advises anyone who becomes unwell to contact their GP or call Healthline on 0800 611 116 for free advice from trained registered nurses.