Pregnant women and pensioners have been urged to follow in the footsteps of more than one million people in NSW and get the influenza vaccine.
More than one million shots have been delivered in NSW ahead of the launch of the state's winter influenza campaign on Wednesday.
Premier Gladys Berejiklian said the vaccine was safe, does not give the recipient the flu and is free for young children, pregnant women and the elderly.
Almost 10,000 people in NSW had already been diagnosed with flu this year - more than triple the number diagnosed during the same period in 2017.
The 2017 season was one of the most severe on record, with 654 deaths, 100,000 diagnoses and 588 institutional outbreaks across the state.
"We don't want to see that happen again," the premier told reporters.
"We don't know what kind of season this will be but we to make sure we protect as many people as possible."
Australian Associated Press