The number of new cases of the herpes virus has risen to 1.36 million, according to data released by the Australian Athletics Federation.
The figure is up from 1.2 million reported in July.
A total of 1.32 million Australians have contracted the disease since January.
It is the first time that the number of reported cases has risen in more than a year.
It was up from 2.3m in July, according the latest figures.
There were 4,813 new cases in the first six months of this year, compared to 4,200 in the same period last year.
The figures show the number has increased every month since the last figure was released in June.
More: The figure includes the number who have tested positive for the virus.
At the end of July, there were 1,068 new cases, compared with 1,022 in July last year, according Australia’s National Health and Medical Research Council (NHMRC).
HIV has been linked to the spread of various diseases including cervical cancer, and other cancers.
The disease is spread through direct contact with an infected person’s bodily fluids.
The number is thought to be under-reported, however, due to the risk of not getting tested or not being able to obtain medical attention.
The data also shows that there has been a rise in the number and frequency of cases in NSW, the ACT and Victoria.
In July, 1,023 cases were reported in NSW.
The ACT recorded 521 new cases.
Victoria had 631 cases.