Six Qantas baggage handlers working at Adelaide airport were confirmed to have tested positive to Covid-19 this week.
South Australia Health said up to 100 baggage handlers and ground staff may have to self-isolate for 14 days.
South Australia’s chief public health officer Nicola Spurrier has advised passengers to wipe down their baggage as a precaution.
“I think the risk is actually extremely low, but there’s absolutely no harm in giving your suitcase a wipe particularly around the handle,” she told ABC Radio Adelaide.
People who travelled through the airport since Monday and who may have symptoms are being asked to get urgent testing.
The latest cluster follows a break-out of coronavirus cases in the Barossa Valley.
The cases are linked to two groups of tourists from the US and Switzerland.