The nurse is a “historic” case of the virus, reported by Chief Health Officer Jeannette Young on Friday morning.
She was not symptomatic throughout her infection period.
“So this is yet another nurse who has, unfortunately, through doing nothing wrong, contracted the infection, from a gentleman who is clearly a superspreader,” she said.
“It’s not his fault either.”
The man was a returned traveller from Europe who passed on the virus to a doctor at Princess Alexandra Hospital on March 12.
There were no further cases of community transmission as a result of that local case.
However, last Friday, another nurse at the hospital was also diagnosed with the virus.
Young believes the case reported on Friday morning is the link between the two of them.
“We managed to pick her up through being a contact of course, and we have done serology that’s come back positive, not a PCR test.
“She’s treated the same patient that the doctor who got infected treated.”
Her infectious period is determined to be from 10 March to 23 March, Young said.
Aside from the historical case, there were no further cases of COVID-19 in the community.
Seven other cases were reported in hotel quarantine.
More than 35,000 test results were processed in the last reporting period.
The three-day snap lockdown ended at midday on Thursday.
However, a raft of restrictions will remain in place for the entirety of Queensland over the coming fortnight.
Masks are required to be carried at all times and used in indoor settings, like shopping centres and rideshares.
Dining at hospitality venues, including pubs, cafes and restaurants, must be seated. Those businesses must also follow the two-square-metre density rule.
Dancing is also banned in public venues.
Home gatherings are capped at no more than 30 guests.
Aged care facilities, disability care facilities, hospitals and prisons will only accept non-residents visiting someone who is deemed as “end-of-life”.
Outdoor events can continue provided there is a COVID-safe plan.