• Tue. Jun 15th, 2021

The Delta coronavirus strain that originated in India has now been detected in Melbourne, Victoria’s Chief Health Officer says


Jun 4, 2021

The Delta coronavirus strain that originated in India has now been detected in Melbourne, Victoria’s Chief Health Officer says.

Key points:

  • The Delta strain hasn’t been found before in the Victorian community
  • The variant was detected in members of a Melbourne family which travelled to NSW last week
  • Health officials have not ruled out the possibility the infection of the Delta strain occurred in NSW

Brett Sutton said the Indian variant known as the Delta strain had been identified in two cases that were “unrelated to all of the other cases in our cluster thus far in Melbourne”.

He said the variant was “infamous” in India and the United Kingdom.

“It is a variant of significant concern,” Professor Sutton said.

He said authorities had been unable to closely link the cases to other Delta variant cases previously sequenced from hotel quarantine systems across Australia.

Victorian health authorities were working with their counterparts across New South Wales, the ACT and the Commonwealth to try to check the sequencing against any positive cases that had recently come into their care.

“We will look at all other sequences, re-sequenced to the fullest extent possible across Australia to see if there are any potential linkages to known cases and that includes those who have come through formal quarantine but also anyone else, maritime, airline, diplomatic,” Professor Sutton said.

The Delta strain was detected in members of a family that is known to have travelled from Melbourne to parts of New South Wales, including Jervis Bay and Goulburn.

Several service stations in Wallan, Euroa, and Glenrowan, where the family stopped on May 24 en route to New South Wales are listed as exposure sites.

The possibility that the family picked up the Delta strain while in New South Wales has not been ruled out.

“But five or six days [of incubation] does put it potentially in New South Wales, Jervis Bay territory or indeed earlier, back in Victoria,” Professor Sutton said.


The Delta variant was detected in members of a family which had travelled from Melbourne to New South Wales.

Health officials were working under the theory that the virus was spread between a child from that family and another child at their school in North Melbourne.

“We suspect so, but we need to look further, but that’s the likely transmission at the moment,” he said.

It’s believed one of the parents of the West Melbourne family is the index case in the Delta outbreak, which has now been linked to seven cases across two families.

Another child has also returned an indeterminate test result, but is expected to be confirmed later as a positive case.

Around 300 primary close contacts of the family have so far been tested.

Professor Sutton said there was anecdotal evidence that the Delta strain may be both more transmissible in children, and lead to a greater severity of illness in children.

The Australian Health Protection Principal Committee, which is comprised of Australia’s Chief Medical Officer, and his state and territory counterparts, has met to discuss the emergence of the Delta variant in the community.

Australia’s Chief Medical Officer, Paul Kelly, said there was some evidence that vaccines may not be as effective against the Delta strain.

A temporary travel ban on Australians returning home from India was imposed on April 30, in response to the growing number of COVID cases in India, but has since been relaxed.

Prime Minister Scott Morrison said the pause did the job it was designed to do.

“The India pause proved very effective, it came at exactly the right time and its intent was to prevent a third wave in Australia, and while we have a challenge in Victoria, it wouldn’t be described in those terms,” he said.

“That pause has seen the effect of reducing both the number of cases that have been presenting in quarantine and the caseload of cases in quarantine came down dramatically.”

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