The HSE says four thousand residents and staff at nursing homes are being tested for Covid-19 this weekend.
There are now 248 outbreaks of coronavirus in those settings - affecting 40 per cent of all homes.
The HSE says that's their "greatest challenge" in tackling the spread.
Chief Clinical Officer, Dr Colm Henry, says they're ramping up testing in long-term residential care facilities and focussing on three groups:
