During week 18 of 2026, 1,618 cases of acute respiratory infections and influenza were reported among a monitored population of 347,913 people, representing an incidence rate of 46.51 per 10,000 population. During the previous week, 1,645 cases were reported (an incidence rate of 47.28 per 10,000 population). The national average incidence rate has decreased slightly compared to the level of the previous week. Most regions report low incidence rates. The incidence rate in the 5–14 and 15–29 age groups has increased slightly compared to the figures from the previous week. In the other age groups, the rate has decreased.