However, Murrumbidgee Local Health District's public health unit aren't relaxing yet. They brought Griffith City Council, Safework NSW and Murrumbidgee Police District to help prepare for a potential outbreak of the virus on a citrus farm.

The scenario was only on pen and paper - but was vital in preparing the people who will be responsible for controlling any outbreak.

Senior environmental health officer Tony Burns said the real advantage was having Griffith citrus grower Vito Mancini participate.

"We got first hand experience with what happens on the farm, how they get people to work on the farm," Mr Burns said.

In a typical year backpackers would move around seeking out farm work and usually have no fixed address.

Mr Burns said the scenario played out from rumours, to contact tracing and then patients being admitted to hospital.

"We wanted to explore various issues that could and would happen if we had an outbreak," he said.

"It was a worthwhile scenario that gave all the agencies a much closer understanding of how we would work together to handle what is a very complex issue."

Mr Mancini said everyone had a role to play in stopping COVID-19.

"It was a fantastic scenario to play a part it, to try and fill in all the knowledge gaps," Mr Mancini said.

"Ultimately it's MLHD and their teams which have the job of limiting the spread of COVID-19.

"Griffith District Citrus Growers fully supports the efforts of MLHD in their roles in controlling any outbreaks of COVID-19.

While early citrus varieties are being harvested now, international travel rules had limited the number of backpackers converging on the district.

Mr Mancini said it meant growers were more reliant on locally-based labour.

"If any employer has employees moving in from out of town, I hope they maintain social distancing as much as possible," Mr Mancini said.

"The citrus industry is a large employer, and most employees are locally based around the region, with some movement around the other fruit growing districts."

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He said getting involved in the COVID-19 scenario was an opportunity that no growers should pass up if they have the chance.

"Glad they considered the scenario with our industry, better planning leads to better results," Mr Mancini said.

"If anyone gets the opportunity to work with this sort of scenario, it's a good opportunity."

He said for citrus growers looking to minimise the risks for their workers, Citrus Australia had released a guide on its website.

Murrumbidgee Police District Chief Inspector John Wadsworth said the value of exercise was bringing the agencies responsible together to understand their perspectives.

Particularly helpful was hearing from a grower which he said would lead to a better response.

"It's exceptionally good, it gives us an insight into the what if's," Chief Inspector Wadsworth said.

"The local community will appreciate that we've been very fortunate not to have any locally transmitted instances of COVID-19," he said.

Chief Inspector Wadsworth said complacency was the biggest worry for the community.

"From a policing perspective, we were impressed with how growers and backpackers have moved to take this seriously and make sure the risk of infection is as low as it can be."