Coronavirus: Wagga Black Lives Matter rally attendees don't need to self-isolate, says Len Bruce

Len Bruce said he had heard questions as to whether "additional measures" were required to prevent a resurgence of COVID-19 after last Saturday's rally drew a crowd of more than 1000 people.

"The medical advice from the deputy chief medical officer is very clear and we're supportive of that, that there's no need for people that attended the rallies to self-isolate," Dr Bruce said.

"But the absolute essential from that information is should they develop any respiratory symptoms they need to self-isolate and get tested immediately."

Dr Bruce reminded the community it could take up to two weeks to develop symptoms after exposure to the virus.

"We're sort of heading towards the first week now, so we will have to remain extra vigilant at least until the end of next week," he said.

Black Lives Matter rallies around Australia saw hundreds of thousands of people march in support of racial injustice protests in the US and against Indigenous disadvantage and deaths in custody.

Prime Minister Scott Morrison said that type of gathering was a "massive spanner in the works" of coronavirus recovery.

However, the protests took place on a long weekend which in NSW saw the easing of travel restrictions, with pubs and cafes open in their largest capacity since lockdown began.

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Dr Bruce said it would be "very difficult to essentially blame a particular event" for new cases, as any scenario where people were in close proximity to others posed the risk of spreading the virus.

"I think we really need to go back to basics here. If you get close to other people, your risk is more. What the reason is for getting close to [other people] probably doesn't really matter," he said.

"The weekend before Mother's Day, the marketplace was really, really busy, and I can assure you not everybody was 1.5 metres away from everyone else."

He said the community should be "especially vigilant" about coming forward to get tested as social distancing measures were relaxed.

"We've done well because of the way we've behaved and acted and we shouldn't dismiss all of that and get into trouble because once again we have seen overseas that it is a devastating illness," he said.

"As we relax social distancing measures, we are expecting more cases ... It's not possible for us to essentially avoid it completely, but to have it in a manageable form where we can cope and have the capacity to treat patients that require treatment."