At least 20 people from Macleod Preschool are in self-isolation following the positive test result, including 12 children and eight staff.
Embracia Aged Care in Reservoir has also been forced into lockdown due to the worker also returning a positive diagnosis.
In a statement on its website, the aged care facility said the employee last worked on May 26, as well as three other shifts in the previous two weeks.
All staff and residents are set to undergo precautionary coronavirus testing.
“We thank the staff member for attending their GP as soon as they developed signs and symptoms as well as staying away from the workplace. Once they returned a positive test, they informed us immediately enabling us to take prompt action,” the statement read.
“We have begun tracing all close contacts, so everyone is informed of the current situation.
“The staff member is now in isolation in their home and managing their symptoms.”
Deputy Chief Health Officer Annaliese van Diemen said the infected employees were detected through routine COVID-19 testing.
A thorough deep clean of the facilities would also be undertaken today.
“The teacher did the right thing, got symptoms and got tested,” she said.
“We haven’t seen it spreading in schools. We will continue to be precautionary.”
The new infections were all household members of known cases.
Ms van Diemen said the cause of the hotel outbreak was still under investigation.
“A number of staff over the past few days have been placed into quarantine,” she said.
“At this point we haven’t determined the precise cause of the outbreak. We know it’s linked to the other cases of returned travellers.”
Victoria’s coronavirus tally sits at 1663. There are nine people in hospital, including two in intensive care.
Community transmission has risen to 169 cases.
The source of the remaining four other new cases is under investigation.
The state has 79 active cases of coronavirus.