Five members of a family, including a pregnant woman, and a doctor treating them tested positive for novel coronavirus on Monday in Vasco town, some 49 kilometres from here, with state health minister Vishwajit Rane saying it may be a case "local transmission within the area".
He said health officials were examining the case.
"Five members of a family from the fishing community and the their doctor tested positive for coronavirus. This looks like a case of local transmission within the area. Authorities are examining all aspects," he said.
"It was found that one of the members of the family had come in contact with a person from Andhra Pradesh where he had gone to buy fish," Rane added.
He said authorities were working on a protocol to declare Mangor Hill area of Vasco city as a containment zone as all positive cases have come from the area.
"This is a new situation for the state. However, this is not a case of community transmission," he reiterated.
The overall number of COVID-19 cases touched 77 in the state, though the number of active ones stands at 33.