A new HSE study aims to provide a national estimate of infection of Covid-19 in the population.
It'll ask over 5,000 people in Dublin and Sligo to take part and will measure their exposure to the virus using antibody blood tests.
It comes as one more person with Covid 19 has died here and there are 8 new confirmed cases.
HSE National Clinical Director for Health Protection, Dr. Lorraine Doherty, says the blood tests will find out the type of antibodies they are carrying
