SA Health has revealed it is enlisting the help of iPhone’s location services in a bid to trace the movements of a couple diagnosed with deadly coronavirus.

The South Australian health authority said it had seized the phones of two Chinese nationals, aged 60, who had tested positive to the virus.

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After initially claiming they had self-isolated, it has now emerged the couple spent at least two days travelling around Adelaide.

On January 22 the pair attended a house auction at Firle, in the city’s eastern suburbs, alongside about 30 other people.

The revelation has sent Ray White’s Dulwich agency into lockdown as the auctioneer and his staff self-isolate.

The Ray White real estate agency at Dulwich. Credit: 7NEWS

Health authorities have been provided with a list of people who attended the auction and are scrambling to get in touch with them.

In a rare move, SA Health investigators are now going through the couple’s phones to pinpoint where else they visited after their arrival.

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“What we will be looking for is when the couple has been in confined spaces with other members of the public,” SA Health’s Dr Nicola Spurrier said.

Spurrier said the language barrier had made communicating with the couple difficult.

The Chinese nationals, currently South Australia’s only confirmed cases of the deadly virus, arrived on January 21 on a flight from Guangzhou to Adelaide.

SA Health is still attempting to contact passengers aboard China Southern Airlines flight CZ 663.

They have urged anyone who thinks they might have been in the couple’s vicinity to come forward.