Nelson-Marlborough has recorded its first new case of Covid-19 since 9 April.
The health board said it has been confirmed in a Nelson woman in her 30s and it was thought to be travel related.
Clinical Director of Public Health Dr Stephen Bridgman said that did not necessarily mean that the case originated in the country of travel.
He said travel-related cases could be caused by contact with an infected passenger on a flight, in transit or by contact with infected people in another country.
Clinical Director of Public Health Dr Stephen Bridgman said the woman was an employee of the New World supermarket in Stoke but was not in a customer-facing role.
Dr Bridgman said close contacts and household contacts were in isolation at home, and would be monitored for symptoms.
He said that the risk to staff and the public was considered to be low, given the use of a face mask in the workplace, the woman did not have a cough and there had been limited movements under alert level 4 restrictions.
Dr Bridgman emphasised that the case was still being investigated by Nelson-Marlborough Health and the Ministry of Health.