The union E tu is calling for district health boards to stop using security contractors after a guard was viciously assaulted at Waikato Hospital early on Wednesday morning. The woman suffered multiple injuries to her head, face and body and remains in the hospital's high dependency unit, while four nursing staff members also suffered minor injuries. E tu Waikato senior organiser Iriaka Rauhihi says the union has had multiple issues with the hospital's security contractor, Allied Security, and it wants DHBs to stop outsourcing the protection of patients and staff. She spoke to our reporter Matthew Theunissen after vising the woman in hospital. The Waikato DHB says an investigation is being carried out to see whether anything could have been done differently. It says Worksafe has been contacted and the guard and her family are being offered support. Allied Security did not respond to requests for comment.