SINGAPORE - There have been two new cases of locally transmitted Zika virus infections at the Poh Huat Terrace/Terrasse Lane area, off Yio Chu Kang Road, said the National Environment Agency (NEA) on Tuesday (April 11).

Both are residents in the vicinity.

NEA has started vector control operations and outreach efforts at the cluster, it added, and the community is urged to take immediate action.

Meanwhile, the Simon Place cluster has closed and will be kept under surveillance, said the agency. It added that "residents and stakeholders are urged to maintain vigilance and continue to eliminate mosquito breeding habitats, as there could still be asymptomatic or mild, undiagnosed cases which might result in further transmission".

NEA is also continuing with vector control operations in the nearby Flower Road/Hendry Close cluster in Kovan, which was confirmed last week.

Outreach efforts such as distributing information leaflets and insect repellents to households are ongoing as well to raise awareness about Zika, reiterate the need to prevent mosquito breeding, and to remind residents to take precautions.

Residents are requested to allow NEA officers to carry out inspections and indoor spraying of their homes, the agency said in a statement.

It added that most infected people do not develop symptoms, heightening the risk of a "resurgence as it may take some time before a reintroduced Zika virus is detected".

Members of the public are advised to seek medical attention if they are unwell, especially with symptoms such as fever and rash. They should also inform their doctors of the location of their residence and workplace, said NEA.