Two “fleeting transmission” cases that had experts worried, and had been used as justification to indicate the infectivity of the mutant virus have been reclassified as negative.
The expert review panel has determined that the two cases linked to a display home and Brighton pub were false positives.
“Moving fast and early to contain and isolate a positive case, and test and trace their contacts is a fundamental part of Victoria’s COVID-19 response,” the Department of Health said in a statement.
“Out of an abundance of caution, the Department will always enact immediate public health measures in response to the notification of any positive cases.”
The two cases were a woman who was thought to have acquired the virus at a Metricon display homes exposure site, and a male who was thought to have contracted the virus at the Brighton Beach Hotel.
COVID-19 Commander Jeroen Weimar this week called some of the cases in the current outbreak as occurring through “stranger to stranger” transmission, and that they were concerned.
“What we’re seeing now clearly is people who are, they’re brushing past each other in a small shop, they’re going around a display home, they’re looking at phones in a Telstra shop,” he said of transmissions linked to the display home, a Telstra store in South Melbourne and a grocer in Epping and Craigieburn shopping centres.
“This is, relatively speaking, relatively fleeting contact. They don’t know each others’ names. And that’s very different to where we’ve been before.“
The false positive linked to Brighton Beach Hotel had authorities on edge because the man was dining outside (where another infectious person was), in a well-ventilated site.
Chief Health Officer Brett Sutton had said “you wouldn’t expect transmission to occur” in a setting like that.
“We still had it as an exposure site, we still informed people to test and isolate until returning a negative, but in fact all of those people will need to be in quarantine because transmission has occurred there,” he said.
“We know that ventilation is a great risk mitigator, but it is not going to do the whole thing when you’ve got a really contagious variant.“
The display homes and Brighton Beach Hotel remain as exposure sites because they are linked to other confirmed cases.