Lynden Aged Care in Camberwell sent a letter to residents’ families on Monday informing them a resident had tested positive for the virus.

The aged care home is carrying out testing and tracing of residents and staff today.

The facility is in total lockdown and the wing where the infected resident resides has been isolated.

Meanwhile, HammondCare in Caulfield, a dementia facility, also went into lockdown on Monday after a resident tested positive for coronavirus.

The resident has been tested a second time and returned a negative result this morning.

The nursing home remains in lockdown as a precaution, while the resident undergoes further testing.

Some staff at the nursing home were tested for the virus on Monday, and more staff are undergoing testing today.

It comes after another Melbourne aged care home went into lockdown on Monday after a coronavirus scare.

A resident at Villa Maria Catholic Homes in Bundoora returned an inconclusive test for the virus.

The health department is treating inconclusive tests as positive and the aged care home remains in lockdown awaiting further test results.

“This is a precautionary approach designed to minimise potential spread as quickly as possible,” the department said in a statement.

“Because of the high-risk setting, the aged care facility will continue to be managed as if it were an outbreak site for at least two weeks.”

Meanwhile in Queensland, authorities are investigating how a nurse with coronavirus continued to work at the North Rockhampton Nursing Centre, while showing symptoms.

Health Minister Steven Miles on Monday said he had asked the department’s director-general to commission the investigation.

“We want to understand exactly how it happened, what went wrong, why it went wrong and how we can make sure it never happens again,” he said.

The Central Queensland Hospital and Health Service has also launched an investigation.

More than 40 nurses are in self-isolation and hundreds of people are awaiting coronavirus test results after the nurse tested positive for the virus last week and the aged care facility went into lockdown.

The nurses – who worked in the same unit as the nurse who tested positive – have all tested negative but will be in isolation for two weeks in case they show symptoms and have to be retested.

Thirty-nine residents have been isolated to private rooms of the facility after coming into contact, or potentially coming into contact, with the infected nurse.

A further 35 have been relocated to other facilities and hospitals in the area.