ARARAT Rural City's number of coronavirus cases currently sit at five - with four false-positives in the results - according to the Department of Health and Human Services.
A spokesperson for the department said the figures should be adjusted in coming days to reflect that as of Tuesday there was only one confirmed case in the local government area.
The department on Monday updated the municipality's cases to include three initially inconclusive tests that were recorded at the Hopkins Correctional Centre in Ararat.
"Three additional cases in this LGA initially returned a positive result but were subject to further testing and subsequently returned negative results," a statement said on Monday.
A further case at prison - which was inconclusive but subsequently found to be negative - was recorded in the data overnight Monday. It was not known when the case emerged or if it was part of the earlier group.
The Victorian prison went into lockdown as a precaution after the three prisoners initially returned inconclusive tests for coronavirus.
The prison has since been thoroughly cleaned.
The total number of coronavirus (COVID-19) cases in Victoria as of Tuesday was 1509 - with 17 new cases since Monday.
Eight of the new confirmed cases are linked to a Melbourne meat processing facility - six staff and two close contacts - taking the total number of cases in this cluster to 85.
There were no new deaths reported on Tuesday. To date, 18 people have died from coronavirus in Victoria.
The total number of cases is made up of 799 men and 710 women, with people aged from babies to their early nineties.
Earlier: ARARAT Rural City's confirmed cases of coronavirus now sits at four, according to the Department of Health and Human Services.
However, the department has now updated the municipality's cases to include the three inconclusive tests recorded at the Hopkins Correctional Centre in Ararat.
'Three additional cases in this LGA initially returned a positive result but were subject to further testing and subsequently returned negative results," a statement says.
The Department of Justice and Community Safety says three asymptomatic prisoners at the Ararat correctional centre underwent further coronavirus testing after returning initial positive tests.
They were each tested another two times, with all returning negative results.
Contact tracing undertaken as a precaution has led to another 200 prisoners being tested, all of whom have returned negative results.
The prison has also entered lockdown as a precaution and thorough cleaning is being undertaken.
The increase in cases is the first in the Wimmera in more than a month.
Confirmed cases remained steady since April 8, when a third case was confirmed in Horsham Rural City.
Yarriambiack was the first Wimmera municipality to have a confirmed case - its only case - on March 22. West Wimmera confirmed its only known case on April 1.
The Northern Grampians has had three COVID-19 cases to date.
The total number of coronavirus cases in Victoria is 1494 - an increase of seven since Sunday.
To date, 18 people have died from coronavirus in Victoria, with the state's last recorded COVID-19 death was on April 28.
The total number of cases includes 793 men and 700 women, with people aged from babies to their early nineties.
There have been 161 confirmed cases of coronavirus that might have been acquired through community transmission.
Seven people are in hospital, including five patients in intensive care. 1360 people have recovered.
Several cases remain under investigation.
The seven latest confirmed cases are made up of four people returning from overseas travel, two under investigation, and one new case linked to a Melbourne meat processing facility, taking the total number of cases in this cluster to 77.
Chief health officer Brett Sutton urged people to get tested if they had symptoms of the virus.
"Today's increase in cases illustrates once again that while we have been flattening the curve, our battle against COVID-19 is far from over," he said.
"Victorians have done a remarkable job so far sticking to the coronavirus restrictions and staying at home has saved lives. But now is not the time for complacency.
"A record number of Victorians will be tested for coronavirus during these two weeks as part of a major testing blitz across the state.
More than 245,000 tests have been taken to date, and many more swabs are still being processed as part of Victoria's testing blitz.
The department hopes this will better help it understand how the virus is spreading in the community and provide evidence to when it comes to slowly easing restrictions.
"The main aim of this increase in testing is to improve access and actively search for cases, allowing us to gain a better picture of this virus and make informed decisions for Victoria," Professor Sutton said.
"We are asking Victorians to again play their part and get tested if they have symptoms, because the more tests we do, the more data we have about the prevalence of coronavirus in the community.
"People with common symptoms of coronavirus including fever, chills, cough, sore throat, shortness of breath, runny nose or loss of sense of smell - however mild - are encouraged to get tested."
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