Two staff members and one patient of the Bay of Plenty District Health Board have tested positive for Covid-19.
On Sunday the board said one of its staff members in Te Whare Maiangiangi, the mental health ward at Tauranga Hospital, had returned a positive test.
A statement from interim chief executive Simon Everitt on Monday said a second staff member who worked for Adult Mental Health and Addiction Services also tested positive over the weekend, along with a patient in the ward.
The second staff member had been in isolation for two weeks "as a result of contact tracing two weeks ago".
The patient was quarantined in the ward and was being cared for by staff in appropriate protective equipment. The ward was closed to new admissions.
All staff members and patients who had contact with any of the three were being tested, and their close contacts were being traced and advised to get tested.
The statement did not address how each individual was thought to have caught the virus.
"We are confident that our staff were scrupulous in following the guidelines and that they did everything possible to keep themselves and others safe," Everitt said.
"Our focus is on identifying and testing all close contacts and preventing the spread of further infection from this outbreak."
One case in the Western Bay was recorded among the nine new cases of Covid-19 in New Zealand today, with numbers unchanged in the neighbouring Lakes area.
The BOPDHB area has 13 active cases as of this morning with one person in a hospital.
Another 33 people have recovered, for a total of 46 recorded cases since the beginning of the pandemic.
The Lakes District Health Board area still has five active cases and none in hospital.
It has had 16 cases in total, with 11 recovered - 10 in Rotorua and six in Taupō.