Pupils going back to school are warned over meningitis
Young people returning to school or college are at higher risk of meningitis as they spend more time indoors in crowded conditions.
The Act for Meningitis charity urges all at risk to be vaccinated and asked for awareness of symptoms.
Older groups are at risk of meningitis C and there have been 20 cases of the strain already reported so far this year.
The HSE said since 2012 the number of cases of invasive meningococcal disease had been falling.
This coincided with the introduction of the meningitis C vaccine in 2000.
In Ireland, MenC vaccine is given to babies at four and 13 months of age as part of the primary childhood immunisation schedule.
A teenage booster is given in first year of second-level school as part of the school immunisation programme.
There are no plans as yet to follow the UK, where young people are given the Men ACWY vaccine, which protects against four different strains.