Introduction:
Measles is a highly contagious viral disease. In recent years, there has been an alarming increase in measles cases in Europe. Most patients were not vaccinated. The aim of this study was to analyse the clinical manifestation of measles in paediatric patients, considering the differences between infants and older children.

Material and methods:
This was a retrospective observational study, for which data were collected from the medical records of paediatric patients hospitalised due to measles January 2017 – December 2019. Stratification was based on age. In the younger group (infants), children under 13 months of age were included.

Results:
In total 84 children were enrolled in the study, including 26 infants (30.95%) and 58 older children (69.5%). In 67/84 (79.76%) participants no history of measles vaccination was reported. Among those not vaccinated, there were 28/67 (41.79%) children too young for vaccination. Fever and erythema occurred in all patients. The disease was complicated by pneumonia in 39/84 (46.43%) and acute otitis media in 19/84 (22.62%) children. Antibiotics were administered in 45/84 (69.05%) cases, of which 10/58 (17.24%) had 2 or more. The infants had significantly less frequent photophobia (p = 0.041693), lymphadenopathy (p = 0.005229), hepatomegaly (p = 0.030619), and splenomegaly (p = 0.019469), Instead, they were significantly more likely to have acute otitis media (p = 0.020141).

Conclusions:
Measles is a serious disease that most commonly affects unvaccinated children. The most common symptoms include fever and rash. Otitis media and pneumonia were the most common measles complications. The variations in symptoms and complications of measles differ significantly between infants and older children.