The research finds that person infected with COVID-19 becomes contagious around two days before symptoms show.
The study then holds that the patients then remain contagious for between seven and ten days after they start showing signs of the disease.
The study examined 73 patients infected with COVID-19.
The authors wrote: “Based on the accumulated data since the start of the COVID-19 pandemic, the infectious period of [coronavirus] in symptomatic individuals may begin around two days before the onset of symptoms, and persists for about seven to ten days after the onset of symptoms.
NCID executive director Leo Yee Sin said: "Scientifically, I'm very confident that there is enough evidence that the person is no longer infectious after 11 days.".
The research confirms a previous study in Germany, that similarly holds that COVID-19 patients stop shedding the virus by day 8 of infection
When asked why it took three days longer in Singapore, Prof Leo said the researchers here were "very conservative and counted till the very last drop"