The farm has also been suspended by the agency until the contamination issue has been rectified, the SFA said in a statement.

The affected eggs have the farm code “CES008” stamped on their shells.

SE can cause foodborne illness if the affected food is consumed raw or is undercooked. It can be present both inside the egg as well as on the surface of the shell.

Symptoms include diarrhoea, abdominal pain, fever, nausea and vomiting.

The bacteria can however be destroyed by heat.

SFA has advised consumers who have purchased the affected eggs to cook them thoroughly before eating them.

“Those who have consumed the eggs and are unwell should seek medical attention,” the agency said.

The affected importers are Ang Seng Eggs Supplier, Dasoon Pte Ltd, Heng Guan Food Industrial and Lam Leng Trading Co.

While SE infection typically subsides within a week, it can cause serious infection in groups such as the elderly, young children and those with compromised immune systems.

To reduce possible infection risk, the SFA advised consumers to ensure eggs are cooked until the egg white and yolk are solid, and to practise proper hygiene to prevent cross-contamination.