many risks when it comes to preventing the spread of AIDS

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Health groups are warning Tasmanians are still taking too many risks when it comes to preventing the spread of AIDS.

This week is AIDS Awareness Week.

Kevin Marriott from the Tasmanian Council of AIDS, Hepatitis and Related Diseases, says the number of HIV diagnoses in Australia has increased by 31 precent in the past seven years - although it has not been as high in Tasmania.

"What we have seen in Tasmania - back in 2004, there was a sudden increase in the number of infections," he said.

"That did drop back down again, but it really hasn't gone back down to levels we saw pre-2000.

"I think they (Tasmanians) are assessing risk very differently, and they're taking into account other things like how infectious somebody may be with HIV, and with them taking a few risks, they're not actually making the right guesses."