About 84 people were swabbed at the Mount Beauty pop-up drive-through testing clinic, which was hastily erected on Friday and closed on Sunday night. A further 21 people were tested in Bright and Myrtleford.

So far all residents and visitors tested have returned negative results.

Alpine Health believes there is a strong likelihood that the viral fragments found in Mount Beauty wastewater came from someone who had already recovered from the virus.

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On Friday afternoon, the Victorian Health Department said a 'weak detection' of COVID fragments in Mount Beauty wastewater occurred on February 1 had been confirmed following further analysis.

The Department asked anyone with symptoms who lived or visited the region between January 26 and February 1 to get tested.

By Friday evening, a pop-up clinic on Tennis Court Avenue had appeared.

Alpine Health marketing officer Nadine Peppler said the preparatory work the health service and its staff had done last year in anticipation of the need for surge testing allowed them to act quickly on Friday.

"This work was critical in allowing us to easily stand up the response," she said.

"Having the skills in our workforce, and relationships with other health services to supplement these skills was also important. "A shared interest in responding to community health need ensures a willingness to move quickly when required."

Alpine Health chief executive Nick Shaw said the response highlighted how residents were committed to the community's health.

"We were encouraged by the collective response, allowing a broad range of expertise to contribute to the response," he said.