The state has recorded 78 new Covid-19 cases overnight in the 24 hours to 8pm Ms Berejiklian warned residents they could be carrying virus with no symptoms Positive results came from 63,000 tests; higher testing rates in the Fairfield LGA High rates of transmission also detected in Hurstville and Kogarah in city's south Greater Sydney is now into its fourth week of strict stay-at-home lockdown rules