Australia’s most populous state has reported its lowest one-day rise in new Covid-19 cases in three days, stoking cautious optimism that authorities have contained an outbreak in Sydney’s northern beachside suburbs.

New South Wales (NSW) said 15 people had tested positive for Covid-19 in the past 24 hours, down on the 36 infections detected a day earlier and bringing the total cases in the northern beaches outbreak to 83.

According to Reuters, more than 80 locations including cafes, gyms, casinos and supermarkets across Sydney were identified as having been visited by people with confirmed cases. Authorities urged anyone who attended the venues to immediately get tested and self-isolate.