Here's what you need to know this morning.

School reopens after coronavirus case

Epping Boys High in Sydney's north will reopen this morning after being closed last Friday when a 16-year-old student tested positive for coronavirus.

Sixty-nine students and staff who had close contact with the teenager will remain in self-isolation for 14 days.

Deputy secretary of the NSW Department of Education Murat Dizdar said the school has been cleaned from top to bottom.

"[It's] business as usual … staff are looking forward to welcoming them in a couple of hours back into school. The school's been thoroughly cleaned with reinforced infection control procedures, including the promotion of healthy hygiene habits."

More cases of COVID-19 in NSW

Two more people have been diagnosed with COVID-19 overnight, bringing the total number of confirmed cases in NSW to 40.

A man in his 70s tested positive after attending St Vincent's Emergency Department on March 6.

The source of his infection is under investigation because he had not travelled overseas recently.

A man in his 40s who had returned from overseas also contracted the virus.

Extra cleaning on public transport

Additional cleaning is being conducted across high-traffic areas in the Sydney public transport network to prevent the spread of coronavirus.

A special taskforce has also been established to coordinate planning for various scenarios, including drivers being infected with COVID-19.

A spokesperson said public health messages were also being displayed at stations encouraging people to wash their hands, cover their noses when sneezing and avoid touching their face.

"In addition, we encourage customers not to travel if they feel ill," the spokesperson said.

$2 million reward for Johnson info

Scott Johnson's death was initially considered a suicide. ( Supplied: Johnson family )

NSW Police made a renewed appeal for information about the murder of Sydney-based American Scott Johnson, who died in Sydney more than 30 years ago.

Johnson's family have matched the NSW Government's $1 million reward for new information, bringing the total reward to $2 million.

The body of Mr Johnson, who was 27 at the time, was found at the base of a cliff at Blue Fish Point near Manly's North Head.

A coronial inquest in 1989 found Mr Johnson took his own life, with a second inquest in June 2012 returning an open finding.

The matter was referred for a third inquest, and in 2017 then-NSW coroner found Mr Johnson fell from the cliff after threats or violence from people who perceived him to be a homosexual.