All 48 sites in Wales now have automated monitoring equipment installed to provide wastewater samples which scientists can test to give insights into the virus.
Erbyn hyn, mae cyfarpar monitro awtomatig sy’n rhoi samplau y gall gwyddonwyr eu profi er mwyn rhoi dealltwriaeth ynghylch y feirws wedi eu gosod ym mhob un o’r 48 safle yng Nghymru.