Two more people have recovered from the virus (288), while the number of active cases increased from 1o to 13.
Cases are considered resolved when they are 14 days past symptom onset date, do not have a fever and COVID symptoms are improving or absent, according to the health unit.
Lambton Public Health follows up daily with cases and contacts throughout their 14-day isolation period.
Locally, a total of 19,118 tests results have been processed since the pandemic began, and 25 people have died.
Bluewater Health currently has no COVID-19 patients, and no one has been treated at the hospital or tested positive for the virus there since mid-June.
Ontario logged a total of 79 COVID-19 cases Sunday, marking a full week with fewer than 100 cases.
Public health safety measures include staying home when sick, practicing physical distancing with others outside your social circle, use good hand hygiene, and wearing a mask if required or if physical distancing is not possible.