How to watch Gladys Berejiklian COVID-19 media conference

Thousands of people across Sydney are on alert today after the state's first COVID-19 case of community transmission in five weeks was recorded.

NSW Premier Gladys Berejiklian is expected to hold a COVID-19 case media conference around 11am where she will give an update on case numbers recorded in the past 24 hours.

You will be able to livestream that media conference when it happens at 9news.com.au, in this article or in our COVID-19 liveblog.

The list of venues visited by the man has been expanded to include a golf club, a gym, a chemist and a supermarket.

NSW Health overnight expanded the health alert to almost 20 venues and revealed fragments of the coronavirus had been detected in the Marrickville sewage network, servicing about 42,000 people

Authorities urged residents of Dulwich Hill, Marrickville, Summer Hill, Lewisham, Ashfield, Haberfield, Petersham, Lilyfield and Leichhardt to be "especially vigilant" in monitoring for symptoms and getting tested.