Nine residents of a Co Laois nursing died over the bank holiday weekend, eight of whom had tested positive for the coronavirus.
They were aged between 66 and 84 years old.
The 17 remaining residents at the Maryborough Centre for Psychiatry of Old Age, are being treated as if they are Covid-19 positive, regardless of test results or presence of symptoms.
While a number of staff are currently on sick leave, the HSE says the current staffing level is sufficient to manage the centre.
Amanda Phelan, Professor of Ageing and Community Nursing, at Trinity College Dublin, says the situation in nursing homes has been chaotic.
"I think it's becoming more organised in more recent days, but certainly it has been chaotic and we've seen the clusters rising.
"Nursing homes are a huge challenge in terms of infection control and delivering good care."
