Staying at home if unwell, good respiratory etiquette and hygiene practices, are all key to protecting children from RSV.
That's according to the HSE after the highest number of cases were recorded in the country last week.
Health authorities are encouraging all parents of children aged 2 to 17 to get them the free Nasal Spray Flu Vaccine.
Dr Ciara Martin is the HSE National Group Lead for Children and Young People.
She outlines the symptoms parents should look out for if they are concerned...