The Australian state of Queensland has vaccinated 200,000 people against the A/H1N1 flu within a month of its release.
"This is a very good result to get 200,000 in such a short time, " Queensland Health director-general Michael Reid told reporters in Brisbane on Thursday.
"Many of those are being done in the private sector through a general practitioner (GP)."
He said health workers and many people in the vulnerable Aboriginal communities were taking up the vaccine.
Chief health officer Jeannette Young said sporadic cases of A/ H1N1 flu could occur this summer because of the northern hemisphere's severe winter flu season.
"I'm recommending people go ahead and get their vaccine now because we are not sure when the flu season will start next year but we suspect it will start a lot earlier than normal," Young said.
She said authorities were still assessing what dosage was suitable for children under 10 but believes the vaccine would be available to them next month.
Anyone traveling to the northern hemisphere is being advised to receive a A/H1N1 flu shot.