The highest number of suspect cases are in NSW, where 77 people are being tested, according to data released by the Department of Health and Ageing on Saturday morning.

There are 15 in Western Australia, 10 in Queensland, eight in Victoria, six in the ACT, five in South Australia and no suspect cases in either Tasmania or the Northern Territory.

So far no one has tested positive in Australia for swine flu, with tests generally taking a few days to provide results.

Meanwhile, a second Australian has tested positive for the potentially deadly virus in London.

The 29-year-old Sydney builder, who moved to the UK from Australia less than a month ago and doesn't want to be named, has been told to stay home and avoid contact with others, ABC reports.

Earlier, fellow Sydney man Mark Robertson, who is also living in London, was told he had the virus after a beach holiday in Puerto Escondido on Mexico's west coast.