The Health Service Executive (HSE) is investigating a new outbreak of swine flu at a secondary school in Co Galway.
A number of students displayed flu-like symptoms, and six students were later confirmed as having H1N1. The school, Calasanctius College in Oranmore, will remain open, the HSE said.
Director of Public Health for the HSE West region Dr Diarmuid O Donovan said the public health team was working with the school and was on hand to advise it at all times.
He advised parents of children who were displaying symptoms to keep them at home for seven days from the onset of the illness, and said sick children would be sent home from school.
The latest outbreak follows reports of incidences of the virus at two Cavan schools in recent days.
At least one case of the H1N1 virus has been confirmed at Breffni College secondary school and about 20 other students presented with flu-like symptoms yesterday afternoon.
The HSE said it was working closely with the school and the principal would be writing to all parents. It stressed the school remained open, but students with symptoms should stay at home for seven days.
Laragh National School, also in Cavan, where an outbreak of swine flu was confirmed on Wednesday, also remains open.
At least four cases of H1N1 virus have been confirmed among students attending at the Laragh school, but several other students who were never tested are recovering at home from symptoms of the virus.
Dr Darina O'Flanagan, director of the national Health Protection Surveillance Centre, said most of those who had been absent from the school had not been sufficiently ill to need to see a GP.
Dr Kevin Kelleher, assistant national director of population health with the HSE, said there had also been a number of outbreaks, varying in size, at other schools.
It is understood a small number of cases were also confirmed at two Cork schools this week.
Meanwhile, the Department of Health, at its weekly media briefing on swine flu yesterday, confirmed five more people were hospitalised with swine flu in the past week, but rates of the viral infection in the community remain relatively stable.
Chief medical officer Dr Tony Holohan said a total of 91 people have now been hospitalised with the H1N1 virus since the pandemic began, 24 of whom remain in hospital.