New figures have shown that 381 people have been diagnosed with the mumps so far this year.
The figures are from the Health Service Executive (HSE) and the Health Protection Surveillance Centre (HPSC).
They run from week one to week eight of 2019.
They show that cases are most prevalent in those aged between 15 and 24, while younger age groups and the elderly have seen the least number of cases.
Just over 200 cases were attributed to men, while almost 170 were of women. Three of the cases did not specify their gender.
Some 115 of the cases so far this year were in the Eastern region, while just nine diagnoses were confirmed in the South East area.
The total has seen a spike when compared to the figures for the same time in 2018.
Mumps is an acute viral infection that is spread from person to person.
Symptoms of mumps include fever, headache, tiredness and swollen and tender salivary glands, located just below the front of the ear.
Mumps often gives the appearance of swollen cheeks or jaw.
Anyone with symptoms is advised to stay at home, not go to school or work and phone their GP and explain they may have mumps.
The HPSC has said the best protection against mumps is to be fully vaccinated with two doses of the Measles-Mumps and Rubella (MMR) vaccine.
A nurse holds up a combination vaccine against measles, rubella, and mumps in a doctor's office in Berlin, Germany | Image: Bernd von Jutrczenka/DPA/PA Images