Director of clinical services Maree Woodhouse said there had been an influx of asymptomatic people presenting at the testing clinic.

She suggested "many" Wimmera-Mallee employers had requested their staff provide evidence that they do not have the virus.

"Under DHHS rules, we are simply not allowed to test asymptomatic people just because they have a letter from their employer requesting we do so," Ms Woodhouse said.

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"Even those employed by freight companies cannot be tested.

"The Department of Health and Human Services issued updated guidelines last week and they state quite clearly that the Victorian Government has not made testing a requirement for freight industry workers."

Ms Woodhouse said though the WHCG did not like turning people away, they had to follow state government testing guidelines.

"We want people to get tested but to be eligible, they must have COVID-19 symptoms, no matter how mild they might be," she said.

"People with letters from their employer, school or community group will not be tested under the current rules."

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The only people eligible for asymptomatic testing are people identified by the DHHS as a close contact of a known case and elective surgery patients requiring preoperative testing.

The Australian Department of Health also states employers should not ask employees that have completed a 14-day quarantine period to be tested for COVID-19 in order to return to work.

The WHCG has been testing an average of 20 people a day since the drive-through service closed in late-August.

Ms Woodhouse said she did not want to deter eligible people from testing.

"We want people with any symptoms to continue getting tested, even if they have been swabbed before," she said.

"We need evidence to show that the community is free of COVID-19 so the more proof of negative cases we have, the better."

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As of Thursday morning, there were three active cases in the Horsham Rural City Council local government area.

Ms Woodhouse said WHCG was grateful that the community had been compliant throughout the pandemic.

"Wimmera Mallee people have done the right thing and no laws have been breached. Even those who tested positive have isolated correctly and kept the rest of us safe.

"We are thankful to everyone for that."

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