Ten people have died this year from influenza in Canberra, as the ACT experienced one of its worst flu seasons on record.
Health officials say 3402 flu cases have been recorded in the national capital so far this year.
The figure is more than the number of confirmed diagnoses for the whole of 2016, 2017 and 2018 combined.
Flu cases in Canberra increased this year by more than 1100 per cent after just 267 confirmed cases in 2018.
Acting chief health officer Dr Kerryn Coleman said while the number of confirmed cases was high, it did not lead to a higher number of deaths or hospitalisations.
"[Deaths] have all been in people with risk factors for flu-related complications," Dr Coleman said.
"There have not been any deaths in children.
"Clinical severity for the season to date, as measured through the proportion of patients admitted directly to the intensive care unit, and deaths attributed to influenza, is low."
Children under nine made up 24 per cent of all flu cases this year, compared to 26 per cent in 2018 and 17.5 per cent in 2017.
Dr Coleman said while winter had ended, a large number of cases had still been reported to health authorities.
"Current influenza activity remains high, but has been decreasing since the second half of August," she said.
"Cases of influenza are reported all year round, however it is expected that numbers will continue to decrease as we head into the warmer months."
The ACT's flu numbers follow the national trend.
There have been more than 250,000 confirmed cases, the highest number of diagnoses in a single year so far this century.
More than 430 people have died due to the flu in 2019 nationwide.
Chief executive of the Immunisation Coalition Kim Sampson said the high number of flu cases this year came from a larger number of diagnoses seen earlier than expected.
"It's been a very unusual influenza season in the sense that there was a high rate of confirmed cases in summer, when we normally see low levels," Mr Sampson said.
"The critical thing is that there's no vaccination available at that time, so you have influenza circulating and no resistance to it."
A lack of herd immunity to influenza was also responsible for this year's flu season, after a lower number of cases were detected in 2018.
"That was quite a mild year, and as a result, there's very little community immunity," Mr Sampson said.
"It's set up a situation where there's very little of that immunity and an early start to the season, and a mutation of the influenza strain going on, and when you add all those things together, it's like dry tinder when a bushfire is about to start."
Pharmacy Guild of Australia ACT branch president Simon Blacker said more than 20,000 people had been vaccinated in Canberra this year at pharmacies alone. That number is on the rise.
"We saw a nearly 40 per cent rise in 2017 and we're expecting a rise this year of between 60 and 70 per cent, which is really good," Mr Blacker said.
"The manufacturers of the vaccine look at what happens in the northern hemisphere winter and choose the most appropriate strains to protect people in our winter.
"There are various strains, but the more people that get vaccinated every winter, the better the herd immunity for the ACT community will be."
ACT health authorities said the vaccine was still available and was free for children under five, pregnant women, people older than 65 and Aboriginal and Torres Strait Islanders.