Three people, two Singaporean citizens and one Myanmar national, have tested positive for the novel coronavirus disease, COVID-19, after visiting Batam, Riau Islands, Singapore’s Ministry of Health announced on Sunday.

The three cases bring the number of COVID-19 patients who tested positive after visiting Indonesia to seven.

The three people, identified only as Case 101, Case 103 and Case 104, visited Batam together from Feb. 21 to Feb. 23, and are part of a cluster of COVID-19 cases linked to Wizlearn Technologies Pte Ltd, a Singaporean software company.

The Ministry of Health’s website announced that Case 101, a 61-year-old male Singaporean citizen, tested positive for the disease on Saturday.

Case 103, a 37-year-old Singaporean woman, and Case 104, a 25-year-old Burmese woman, were announced as confirmed cases on Sunday. Case 103 is a colleague of Case 101, while Case 104 is a domestic worker employed by Case 103.

The two women had close contact with a previously confirmed case, a 38-year-old male Singaporean identified as Case 93. Case 93 is a relative of Case 103 and tested positive for the disease on Feb. 26. The ministry’s website said that he did not have any recent international travel history.

Cases 103 and 104 had been under home quarantine since Case 93 tested positive. On Feb. 29, both reported that they previously experienced COVID-19 symptoms.

“[Case 103] revealed that she had onset of symptoms on Feb. 20 and had sought treatment at a general practitioner clinic on Feb. 25,” the ministry’s press release said. “[Case 104] she revealed that she had onset of symptoms on Feb. 23.”

They were then immediately taken to the National Centre for Infectious Diseases (NCID) where they were isolated. Their test results confirmed they were infected with COVID-19 on Sunday morning.

Achmad Yurianto, the Indonesian Health Ministry's Disease Control and Prevention Directorate Secretary, told The Jakarta Post on Monday that the ministry was "conducting contact tracing" of the patients without giving further details.

Cases 101, 103 and 104 are the latest of seven cases in which patients tested positive for COVID-19 after visiting Indonesia. Previously, four other patients – in China, Japan, New Zealand and Malaysia – tested positive shortly after returning from Indonesia.