Dr Rui Marie De Araujo, CIGC’s spokesperson, said 801 people from the municipalities have been subject to testing for the respiratory disease.
He said they have found no new positive cases.
Although Timor-Leste has not registered a single new infection for over three weeks, CIGC is not certain if community transmission has taken place and it is currently continuing its surveillance and testing program.
Authorities are concerned about people crossing the border illegally, with COVID-19 infection levels still high in Indonesia.
Four people known to have entered the country at the Sakato border in Oecusse were arrested and put in quarantine in Dili on Friday, Dr Araujo said.
Authorities, meanwhile, urge the public to contact police if they have any information about people entering Timor-Leste illegally.
The country’s borders have been shut since March as part of government efforts to curb spread of the coronavirus.
Globally, there have been more than 4.7 million known cases of COVID-19, and nearly 315,000 people have died, according to Johns Hopkins University. More than 1.7 million people have recovered.