WellSouth medical director Stephen Graham said those tested would need to wait up to 72 hours to get their results back.
"We're very lucky here that we have got a lab in Dunedin and generally process a lot quicker than other places."
Testing turnout was higher than expected, and more tests were needed.
"We've been doing quite a lot of testing of asymptomatic people, particularly Maori and Pacific Islanders, but also backpackers who are considered to be high-risk."
He said the testing was to address concerns the disease could be spread by asymptomatic people in the community.
"This is our attempt to find out if that is the case."