Australians who were falsely told they'd tested negative for COVID-19 on Christmas Day fear they might have infected family members

• A lab in Australia mistakenly told more than 400 people they didn't have COVID-19 on Christmas Day.
• Now those affected are worried they spread the virus to family members on Christmas.

Australians who were falsely told they'd tested negative for COVID-19 when they had the virus fear they infected family members over Christmas.

A number of people are speaking out after SydPath lab in Sydney said in a statement shared with the BBC that 486 patients were falsely told over the Christmas holiday that they were negative for COVID-19 when they actually had the virus.

The lab has admitted to its mistake and said in its statement to BBC that 886 people were given test results before their specimens were processed.

Stephanie Colonna was one of the 486 who found out her COVID-19 test was positive on Sunday, she told Australia's "Today" show.

After days of trying to get a swab, Colonna finally got a test on December 22. By Christmas, she had a notification from the lab notifying her she did not test positive for the coronavirus.

But on Boxing Day, Colonna was told she'd tested positive.

"I was just mortified to get two different results. You don't know what to feel," Colonna told "Today."

Now she's worried about passing along the coronavirus to her niece and nephew who aren't yet old enough to have the vaccine.

"That's what scares me and worries me because if they're positive, I'm the one to blame. I've infected them now," she said.

Another couple that fell victim to false negatives was doubtful of their test results after days of symptoms and direct exposure to someone with the coronavirus.

They isolated until their positive results from SydPath came through, but Tara Hong, who is diabetic, said the lab company delayed her from getting the help she needed to fight the virus, ABC News reported.

"I'm a diabetic, so I fight things worse, which is probably why I'm sicker than everyone else; I've had my booster and I'm still very symptomatic, so I'm struggling," she told ABC News. "SydPath has delayed me getting any help if I could."

The lab said an "unprecedented" number of tests caused the screw-up and that switching from an automatic to a manual system played a role, according to the BBC.

"Unfortunately... a simple data processing error was made which led to the wrong test results being released," the statement said.

In response, the lab is switching back to automated tests only and is also cutting back on the number of tests it makes available to avoid this from happening again, according to the BBC.

The testing mishap happened as coronavirus cases surge in New South Wales. The state had 5,533 positive tests in the past 24 hours as of Tuesday, accounting for more than 50% of total new cases in Australia, according to the Australian Department of Health.

New South Wales reported its first death from the Omicron variant Monday — a man in his 80s who was vaccinated but had underlying health conditions, The Associated Press reported.

SydPath did not immediately respond to Insider's request for comment.