It is the fifth positive test in the south-west since last Friday with two positive tests recorded at Hamilton and three in Warrnambool.

Western District Health Service confirmed that the second person had tested positive to COVID-19 in Hamilton after being tested on Monday.

Chief executive, Rohan Fitzgerald said the person returned from overseas and immediately self-isolated, before becoming unwell and presenting for Drive-Thru testing.

"My understanding is that the person involved has done all of the right things, placing themselves into isolation immediately on his return from the UK," he said.

"I have been told that his family have supported his isolation, by dropping groceries and other essential items at his door."

The first case in the south-west was a positive test at the Hamilton drive-thru clinic which was revealed in Friday after someone "transiting" the city on their way interstate last Wednesday got tested.

Three people in Warrnambool have tested positive since Saturday.

Mr Fitzgerald said WDHS is continuing to monitor the local population and the Drive-Thru Clinic was proving very effective in minimising exposure to others in the hospital environment.

"At the Drive-Thru we are screening around 20 to 30 people a day, and testing up to 15 of those individuals in their cars. The patients who are tested are sent home to self-isolate, until they receive their results."

"In total, we have screened 139 people at the Drive-Thru Clinic and 58 have met the testing criteria.

"The flow of the Drive-Thru Clinic has been working really well and we are very grateful for the support provided by the Southern Grampians Shire road traffic management team.

"Over the coming week, we are expecting the numbers of people at the Drive Thru to increase, and may make some changes to clinic hours, depending on demand."

The current operating hours are Monday to Friday, 1pm to 3pm and this week the clinic would be extended to include Saturday from 9am to 12pm.

"It is so important for people to come through the Drive-Thru if they have flu-like symptoms, a fever, have travelled internationally in the last 14 days, or come into contact with a known or suspected case," he said.

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