People are being warned against consuming shellfish collected directly from the Wexford and Waterford coastline due to the presence of poisonous toxins.
The warning from the South Eastern Health Board follows the discovery of a large quantity of illness-inducing algae off the south-east coast at Wexford Harbour, Bannow Bay, Ballytiegue, Waterford Harbour and the Dungarvan area.
Shellfish such as mussels, oysters, clams and scallops should be avoided, particularly by recreational collectors, due to a build up of naturally-forming bacteria, viruses and poisons.
Shellfish filter food from the water like a sieve, which often results in the absorption of germs. Since shellfish are regularly eaten raw or lightly cooked, the bacteria can survive and cause illness.
People who have developed gastro-intestinal symptoms or otherwise feel unwell following the consumption of shellfish from the affected areas should seek medical attention.
The Marine Institute's Fisheries Research Centre, in co-operation with Irish Shellfish Producers and the Departments of Health and Marine, is monitoring the detection of toxins in shellfish.
Up-to-date results of these tests are posted on www.marine.ie and www.fsai.ie.