NSW Health says the discovery of the fragments has been “particularly concerning” because there are no known cases of Covid-19 in the Ballina Shire. Residents in the Ballina Shire are being asked to monitor for symptoms of Covid-19, after fragments of the virus were found in the sewerage treatment plant. In an update on Saturday, NSW Health said the fragments were detected as part of the ongoing sewage surveillance program. Fragments were also found at the Broken Hill plant.