Opera Australia has postponed several performances after a construction worker at the Sydney Opera House tested positive for COVID-19.

The company announced Wednesday that dozens of musicians and performers associated with Opera Australia were forced into self-isolation following the positive test. The company’s winter season is now under review as Sydney’s lockdown was also extended one week.

The company noted that members of the orchestra, performers, technicians, and creative staff of “Otello were in rehearsal at the time the subcontractor was working on the Concert Hall refurbishment.

The families and other householders who were in contact with any of Opera Australia’s staff will also have to isolate.

In a statement, the company noted, “We appreciate that this news may cause concern or anxiety for some staff. Your patience and resilience during these ever-evolving challenging times is acknowledged and greatly appreciated.”

According to the Sydney Opera House all on-site operations during the stay-at-home period which Sydney is currently under had been conducted in line with health guidelines. The opera house noted, “Only required staff were on site for rehearsals in preparation for performances resuming, operating in line with strict COVID safety plans and protocols.”

“Otello” was is set to open on July 16 while productions of “Atilla” and “Aida” had already opened.