The parent of two students at Southland Boys' High School and Southland Girls' High School has tested positive with coronavirus.
The students are well and without symptoms, and there was minimal risk to other students, staff or others at the school, the Southern DHB said in a letter to parents of both schools.
In case the students developed the virus in the future, they would stay at home as a precaution - the entire family had entered self-isolation.
It comes after one of eight new coronavirus cases today was announced as living in Invercargill, the Ministry of Health announced on Wednesday afternoon.
Four of the other seven patients were located in Auckland, two in Waikato and one in Christchurch - there were now 20 confirmed cases nationwide.
Contact tracing for the Invercargill patient was under way and any close contacts would be advised to self-isolate for 14 days from when they were in contact.