"The facility will remain in lockdown with regular deep cleaning and residents split into bubbles with allocated staff to reduce the possibility of transmission," a Waikato DHB spokesperson said.
A Camillia Rest Home spokesperson said the staff member acted responsibly and immediately informed them of their positive result. Residents' whānau have been made aware of the case.
"Although we will be unable to have visitors while isolating, we're making sure our residents are able to keep in touch with loved ones through other means such as calls, as that support is particularly important during what can be a challenging time," the rest home said in a statement to the Herald.
The case has been linked to the existing Waikato cluster and there is currently no indication of spread within the facility.
All staff and residents have returned negative tests five days after the time of exposure.
On Sunday there were 113 new cases of Covid-19 in the community and a record 74 patients in hospital with the virus.
Of these cases, 109 are in Auckland, three in Waikato and one in Northland. This brings the total number of active cases in the Waikato to 88.
Since the Covid-19 outbreak there have been 351 cases in Waikato including two deaths.