It follows calls for mandatory check-ins after a taxi driver transported a passenger infected with the Delta strain of coronavirus to the Launceston Airport.

The driver transported about 17 other people before he was made aware of the risk.

Premier Peter Gutwein said passengers of a taxi or an Uber will be required to scan a QR code from Friday at 6pm.

He said public health had continually reviewed requirements on public transport throughout the pandemic.

"In terms of delta that has changed the circumstances," he said.

READ MORE: Kingsway barber reflects on six years in business

The state government will consider QR code requirements on buses and other forms of public transport in the future.

However, Mr Gutwein said the defined routes made contact-tracing easier as opposed to taxis.

In a press conference in Hobart on Monday, Mr Gutwein said more than 6000 people had been tested over four days.

On Monday 1543 tests had been conducted in 24 hours and all were negative.

"We are not immune to COVID in Tasmania and Delta is a different ball game," he said.

"We are more confident in saying the risk of more cases in Tasmania is low.

"It is a prime example of when we work together how we can get things done."

Public Health director Mark Veitch said people who had been in high-risk areas in Queensland had been contacted.

Dr Veitch said about 9000 people had travelled back to Tasmania from the Cairns and Yarrabah region since July 17 and public health was continuing to work on how many people had been in high risk areas.