Singapore Reports First Locally Transmitted Mpox Clade Ib Cases

Singapore has confirmed its first locally transmitted cases of mpox clade 1b, according to an announcement made by the Communicable Diseases Agency (CDA) on April 2, 2026.

The two confirmed cases involved men aged 30 and 34. Both individuals are reported to be in stable condition. These cases mark the first reported infections of the more serious clade 1b variant within the country.

Transmission and Public Risk Assessment

The CDA stated that both individuals were very likely infected through sexual activities. Health authorities emphasized that the primary mode of transmission for mpox is through intimate or prolonged physical contact, which includes sexual contact.

As mpox is predominantly transmitted through intimate or prolonged physical contact, including sexual contact, the risk to the general public is currently low.

Communicable Diseases Agency (CDA)

Clinical Timeline of the First Case

Detailed information was provided regarding the 30-year-old male patient, who had no history of recent travel. His clinical progression occurred over several days in late March 2026:

• March 25, 2026: The patient first developed symptoms.
• March 30, 2026: The patient was admitted to the hospital.
• March 31, 2026: The clade 1b infection was officially confirmed.

Government Surveillance and Border Measures

In response to the detection of the clade 1b variant, the Singaporean government has implemented precautionary measures to strengthen the country’s defenses against the virus. These efforts are focused on enhancing surveillance capabilities at national borders.

The border surveillance initiative is a coordinated effort involving three primary government bodies:

• The Ministry of Health
• The Ministry of Transport
• The Immigration and Checkpoints Authority

These agencies are working together to monitor and prevent the further introduction or spread of the virus into the community.