It's all clear so far for children exposed to unsterilised water in South Auckland.

However, there are still thousands more to be tested after malfunctioning dental equipment put patients at risk of exposure to HIV and Hepatitis.

Pop-up testing clinics resume operation today at Pukekohe Intermediate where blood tests are being conducted.

Counties Manukau Health chief medical officer Gloria Johnson said they've tested hundreds of children so far.

"We haven't found anything so far that's of particular concern, in terms of any special risk factors that have emerged, but obviously the test results won't be back for a couple of days."

Ms Johnson said they've only had to give out a handful of hepatitis B vaccinations.

She said they hope to have contacted all those affected within seven days, and scheduled a consultation for the next three weeks.

"It'd be really good if we've contacted a really signifcant proportion by the time of the weekend. I think it would be really good for people if they felt that, many of them who are most concerned, they could start the long weekend feeling they had some sense of what's going on."