Australia's second most populous state on Wednesday said a man in his 80s died overnight from the coronavirus, the country's first death from the virus in more than a month, as concerns about a second wave of infections saw thousands queue for COVID-19 tests and supermarkets impose new restrictions.

Victoria state reported 20 overnight cases, Victoria Chief Health Officer Brett Sutton told reporters in Melbourne, taking the state tally to nearly 1,900 after recording 17 on Tuesday and 16 the day before.

"When we get additional cases, there will be a risk of people dying or be at risk of further cases being hospitalised and going to intensive care," Sutton told reporters in Sydney.