The HSE has issued a warning about an outbreak of mumps across Galway, Mayo, and Roscommon.
The warning comes as 45 people have been diagnosed with mumps in the western counties in the past seven weeks.
Those affected by the viral outbreak have mainly been between the ages of 15 and 29.
Mumps is viral illness, the symptoms of which can include fever, headache, fatigue, and is most known for a painful swelling of the glands.
While not usually serious, it can cause complications including pancreatitis, meningitis, and swelling of the ovaries or testicles which can lead to fertility problems.
The virus is spread through coughing, sneezing, and other contact with saliva. Anyone infected is advised to stay home from work or school.
The HSE is urging people to take all necessary precautions to protect themselves against the virus.
The best protection against the mumps virus is the MMR vaccine, which is generally administered to children before they’re six years old.
If you are unsure is you have received the two doses of the MMR vaccine, check with your GP immediately and get a booster if needed.