South Australia has recorded its steepest one day jump in the number of cases of the COVID-19 virus since the beginning of the outbreak, with the total number of confirmed cases now sitting at 170.

The new cases have affected teens up to people in their 50s, however, one case in particular has health authorities concerned.

A woman in her 50s might be the state’s first recorded case of community transmission of the virus, as SA Health continues seeking to trace the source of each case.

SA Health’s Dr Nicola Spurrier told 7News that the woman had recent contact with people who had returned from overseas, although they did not show any symptoms of the virus.

“This is obviously concerning,” Dr Spurrier told 7News.

Earlier, Premier Steven Marshall has pointed to the state’s level of testing as reason for hope.

So far, almost 18,000 people have been tested in South Australia with the processing time having now been reduced to 21 hours.

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“Strong testing is a hallmark of how we have worked towards tackling the coronavirus head-on,” Premier Marshall told reporters yesterday.

“I’m very pleased with the level of testing we have done, which gives us a high confidence level that as to this point in time we haven’t had any community transmission of the disease.”